Which I commanded your fathers in the day that I brought them out of the land of Egypt, from the iron furnace, saying: Hear ye my voice, and do all things that I command you: and you shall be my people, and I will be your God:

which I commanded your fathers in the day that I brought them forth out of the land of Egypt, from the iron furnace, saying, Hearken unto my voice and do them, according to all that I command you; so shall ye be my people, and I will be your God:

That I commanded your fathers, In the day of My bringing them out from the land of Egypt, Out of the iron furnace, saying, Hearken to My voice, and ye have done them, According to all that I command you, And ye have been to Me for a people, And I am to you for God,

To the order which I gave your fathers on the day when I took them out of the land of Egypt, out of the oven of iron, saying, Give ear to my voice, and do all the orders I have given you: so you will be my people, and I will be your God:

which I commanded to your fathers in the day when I led them away from the land of Egypt, away from the iron furnace, saying: Listen to my voice, and do all that I command you, and then you will be my people and I will be your God.

Quae (vel, quod foedus) mandavi patribus vestris die quo eduxi eos e terra Egypti, e fornace ferrea, dicendo, Audite vocem meam, et facite ea quae (hoc est, quaecunque) praecipio (relativum sine antecedente; seeundum omnia quae praecepi vobis) et eritis mihi in populum, et ego ero vobis in Deum; (cohoerent hoecomnia inter se, ideo non disjungo)

From the iron furnace - Rather, out of "the iron furnace," Egypt (see Deuteronomy 4:20). The constant reference to Deuteronomy shows how great had been the effect upon Jeremiah's mind of the public recitation of the "Book of the covenant" found in the temple.

Which I commanded your fathers,.... To observe and keep:
in the day that I brought them forth out of the land of Egypt: that is, quickly after, when they were in the wilderness, and before they came into the land of Canaan. The "day" seems to include the whole time from their coming out of Egypt, to their entrance into Canaan's land; it was in the first year of their coming out from thence that the law was given them on Mount Sinai, Exodus 19:1, and it was in the fortieth year, and when they were upon the borders of Canaan, that the covenant was made with them in the land of Moab, Deuteronomy 1:3, "from the iron furnace"; meaning Egypt, and their bondage and affliction in it, compared to an iron furnace for the grievousness of it, its long continuance, and the use of it to try and prove them; see Deuteronomy 4:20,
saying, obey my voice; in the law:
and do them; the commands of it, the words of the covenant:
according to all which I command you; everything was to be done that was commanded, and as it was commanded; a perfect and uniform obedience is to be yielded to the law, in order to enjoy the blessing, or a penalty is incurred:
so shall ye be my people, and I will be your God; this is the tenor of the covenant of works; covenant interest in God, according to the law, depends upon obedience; that is the condition of it; but the covenant of grace is not clogged with such a condition; but runs absolutely,
they shall be my people, and I will be their God, Jeremiah 32:39.

in the day--that is, when. The Sinaitic covenant was made some time after the exodus, but the two events are so connected as to be viewed as one.
iron furnace-- (Deuteronomy 4:20; 1-Kings 8:51). "Furnace" expresses the searching ordeal; "iron," the long duration of it. The furnace was of earth, not of iron (Psalm 12:6); a furnace, in heat and duration enough to melt even iron. God's deliverance of them from such an ordeal aggravates their present guilt.
do them--namely, the words of the covenant (Jeremiah 11:3).
so, &c.-- (Leviticus 26:3, Leviticus 26:12).