When Israel went out of Egypt, the house of Jacob from a people of strange language;

When Israel went out of Egypt, the house of Jacob from a barbarous people:

In the going out of Israel from Egypt, The house of Jacob from a strange people,

When Israel came out of Egypt, the children of Jacob from a people whose language was strange to them;

When Israel went out from Egypt That exodus being a remarkable pledge and symbol of God's love for the children of Abraham, it is not surprising that it should be so frequently called to remembrance. In the beginning of the psalm, the prophet informs us that the people whom God purchased at so great a price are no more their own. The opinion of certain expositors, that at that time the tribe of Judah was consecrated to the service of God, according to what is said in Exodus 19:6, and 1-Peter 2:9, appears to me foreign to the prophet's design. All doubt about the matter is removed by what is immediately subjoined, God's taking Israel under his rule, which is simply a repetition of the same sentiment in other words. Judah being the most powerful and numerous of all the tribes, and occupying the chief place among them, here takes the precedency of the rest of the people. At the same time, it is very evident that the honor which is in a peculiar manner ascribed to them, belongs equally to the whole body of the people. [1] When God is said to be sanctified, it must be understood that the prophet is speaking after the manner of men, because, in himself, God is incapable of increase or diminution. Judah is called his holiness, [2] and Israel his dominion, [3] because his holy majesty, which hitherto had been little known, secured the veneration of all who had witnessed the displays of his incredible power. In delivering his people, God erected a kingdom for himself and procured respect for his sacred name; if then they do not constantly reflect upon such a remarkable instance of his kindness, their insensibility is totally inexcusable.

Footnotes

1 - "Judah represents here the whole people of Israel, as Joseph does, in Psalm 81:6. The reason assigned by Kimchi for this use of yhvdh here is, that at the time of the departure from Egypt, Judah was considered the head or chief of the tribes; see Genesis 49:8-10. This, however, is mere conjecture. If it be necessary to assign reasons for the distinction here conferred on this tribe, I should mention as one:, that the ark was kept in the region occupied by the descendants of Judah, and, as another, that from him the Messiah was to spring." -- Phillips.

2 - God's holiness being often taken for the keeping his promise sacred or inviolate, as in Psalm 102:9, when, reference being made to the immutability of his covenant, it is added, "holy [as in another respect, reverend] is his name;" some, as Hammond and Cresswell, suppose that the meaning here is, that God's dealings towards Judah -- the people of the Jews, were a demonstration of his faithfulness in performing his promise made to Abraham long before.

3 - Hammond reads, "And Israel his power," by which he understands that Israel was an instance of his power; that God, in his acting for Israel, declared his omnipotence most signally.

When Israel went out of Egypt - literally, "In the going out of Israel from Egypt." This is not to be confined to the exact act of the exodus, but embraces all that properly entered into that migration - the whole train of events which resuited in their being brought into the promised land.
The house of Jacob - The family of Jacob - a name appropriately used here, since it was the family of Jacob that had gone down into Egypt, and that had increased to these great numbers.
From a people of strange language - Speaking a foreign or a barbarian tongue. See the notes at Psalm 81:5.

A people of strange language - This may mean no more than a barbarous people; a people whom they did not know, and who did not worship their God. But it is a fact that the language of the Egyptians in the time of Joseph was so different from that of the Hebrews that they could not understand each other. See Psalm 81:5; Genesis 42:23.
The Chaldee has here מעמי ברבראי meammey barbarey, which gives reason to believe that the word is Chaldee, or more properly Phoenician. See this word fully explained in the note on Acts 28:2 (note). My old Psalter understood the word as referring to the religious state of the Egyptians: In gangyng of Isrel oute of Egipt, of the house of Jocob fra hethen folke.

When Israel went out of Egypt, the house of Jacob from a people of (a) strange language;
(a) Or, barbarous.

When Israel went out of Egypt,.... The people of Israel in a body, publicly, openly, and not by stealth; freely and willingly, not forced and drove out; though urged by the Egyptians to go, through the hand of God upon them; and so went out with the mighty hand and outstretched arm of the Lord, and with great riches, and in health, not one feeble or sick among them.
The house of Jacob from a people of strange language; or barbarous; as every language was reckoned by the Jews but their own; the Egyptian language they did not understand; see Psalm 81:5, no doubt many of them learned it during their long stay there, but in general they retained their own language. This was an emblem of the Lord's people in effectual calling, coming out of bondage into liberty, out of darkness into light, out of superstition, and idolatry and profaneness, to the service of the true God in righteousness and true holiness; and from a people of a strange language to those that speak the language of Canaan, a pure language, in which they can understated one another when they converse together, either about experience or doctrine; and the manner of their coming out is much the same, by strength of hand, by the power of divine grace, yet willingly and cheerfully, with great riches, the riches of grace, and a title to the riches of glory, and with much spiritual strength; for, though weak in themselves, yet are strong in Christ.

Let us acknowledge God's power and goodness in what he did for Israel, applying it to that much greater work of wonder, our redemption by Christ; and encourage ourselves and others to trust in God in the greatest straits. When Christ comes for the salvation of his people, he redeems them from the power of sin and Satan, separates them from an ungodly world, forms them to be his people, and becomes their King. There is no sea, no Jordan, so deep, so broad, but, when God's time is come, it shall be divided and driven back. Apply this to the planting the Christian church in the world. What ailed Satan and his idolatries, that they trembled as they did? But especially apply it to the work of grace in the heart. What turns the stream in a regenerate soul? What affects the lusts and corruptions, that they fly back; that prejudices are removed, and the whole man becomes new? It is at the presence of God's Spirit. At the presence of the Lord, not only mountains, but the earth itself may well tremble, since it has lain under a curse for man's sin. As the Israelites were protected, so they were provided for by miracles; such was that fountain of waters into which the flinty rock was turned, and that rock was Christ. The Son of God, the Rock of ages, gave himself to death, to open a fountain to wash away sins, and to supply believers with waters of life and consolation; and they need not fear that any blessing is too great to expect from his love. But let sinners fear before their just and holy Judge. Let us now prepare to meet our God, that we may have boldness before him at his coming.

The writer briefly and beautifully celebrates God's former care of His people, to whose benefit nature was miraculously made to contribute. (Psalm 114:1-8)
of strange language--(compare Psalm 81:5).

Egypt is called עם לעז (from לעז, cogn. לעג, לעה), because the people spoke a language unintelligible to Israel (Psalm 81:6), and as it were a stammering language. The lxx, and just so the Targum, renders ἐκ λαοῦ βαρβάρου (from the Sanscrit barbaras, just as onomatopoetic as balbus, cf. Fleischer in Levy's Chaldisches Wrterbuch, i. 420). The redeemed nation is called Judah, inasmuch as God made it His sanctuary (קדשׁ) by setting up His sanctuary (מקדּשׁ, Exodus 15:17) in the midst of it, for Jerusalem (el ḳuds) as Benjamitish Judaean, and from the time of David was accounted directly as Judaean. In so far, however, as He made this people His kingdom (ממשׁלותיו, an amplificative plural with Mem pathachatum), by placing Himself in the relation of King (Deuteronomy 33:5) to the people of possession which by a revealed law He established characteristically as His own, it is called Israel. 1 The predicate takes the form ותּהי, for peoples together with country and city are represented as feminine (cf. Jeremiah 8:5). The foundation of that new beginning in connection with the history of redemption was laid amidst majestic wonders, inasmuch as nature was brought into service, co-operating and sympathizing in the work (cf. Psalm 77:15.). The dividing of the sea opens, and the dividing of the Jordan closes, the journey through the desert to Canaan. The sea stood aside, Jordan halted and was dammed up on the north in order that the redeemed people might pass through. And in the middle, between these great wonders of the exodus from Egypt and the entrance into Canaan, arises the not less mighty wonder of the giving of the Law: the skipping of the mountains like rams, of the ills like בּני־צאן, i.e., lambs (Wisd. 19:9), depicts the quaking of Sinai and its environs (Exodus 19:18, cf. supra Psalm 68:9, and on the figure Psalm 29:6).