And this is the offering. Hence, what I have before said is more fully continued, viz., that what the poor offer of their little will not be eclipsed by the abundance of the rich, since God deigns to reckon goats' hair among the sacred offerings not less than gold, purple, and precious stones. Again, by the varied and manifold contributions, He would shew, as in a glass, that a variety of gifts are necessary to the building of the spiritual temple, as Paul sets forth in Romans 12 and 1-Corinthians 12. The liberality of the rich was indeed more splendid; but, as they did not scruple to mix their gold and silver, blue, purple, and precious stones, with brass, iron, and other common materials, so also, now-a-days, those who aid the edification of the Church by their more excellent gifts, admit, without contempt or dislike, into fellowship poor brethren, to whom it is not given to equal them.

Gold, and silver, and brass - The supply of these metals possessed by the Israelites at this time probably included what they had inherited from their forefathers, what they had obtained from the Egyptians Exodus 12:35, and what may have been found amongst the spoils of the Amalekites Exodus 17:8-13. But with their abundant flocks and herds, it can hardly be doubted that they had carried on important traffic with the trading caravans that traversed the wilderness, some of which, most likely, in the earliest times were furnished with silver, with the gold of Ophir (or gold of Sheba, as it seems to have been indifferently called), and with the "brass" (the alloy of copper and tin, called bronze) of Phoenicia and Egypt. Compare Exodus 38:24 note.

This is the offering - There were three kinds of metals:
1. Gold, זהב zahab, which may properly signify wrought gold; what was bright and resplendent, as the word implies. In Job 28:15, Job 28:16, Job 28:17, Job 28:19, gold is mentioned five times, and four of the words are different in the original.
1. סגור Segor, from סגר sagar, to shut up; gold in the mine, or shut up in its ore.
2. כתם Kethem, from כתם catham, to sign, seal, or stamp; gold made current by being coined; standard or sterling gold, exhibiting the stamp expressive of its value.
3. זהב Zahab, wrought gold, pure, highly polished gold; probably what was used for overlaying or gilding.
4. פז Paz, denoting solidity, compactness, and strength; probably gold formed into different kinds of plate, as it is joined in Exodus 25:17 of the above chapter with כלי keley, vessels. The zahab, or pure gold, is here mentioned, because it was in a state that rendered it capable of being variously manufactured for the service of the sanctuary.
2. Silver, כסף keseph, from casaph, to be pale, wan, or white; so called from its well-known color.
3. Brass, נחשת nechosheth, copper; unless we suppose that the factitious metal commonly called brass is intended: this is formed by a combination of the oxide or ore of zinc, called lapis calaminaris, with copper. Brass seems to have been very anciently in use, as we find it mentioned Genesis 4:22; and the preparation of copper, to transform it into this factitious metal, seems to be very pointedly referred to Job 28:2 : Iron is taken out of the earth, and brass is molten out of the stone; אבן יצוק נחושה eben yatsuk nechushah, translated by the Vulgate, Lapis, solutus calore, in aes vertitur, "The stone, liquefied by heat, is turned into brass." Is it going too far to say that the stone here may refer to the lapis calaminaris, which was used to turn the copper into brass? Because brass was capable of so fine a polish as to become exceedingly bright, and keep its lustre a considerable time, hence it was used for all weapons of war and defensive armor among ancient nations; and copper seems to have been in no repute, but for its use in making brass.

And this [is] the offering which ye shall (b) take of them; gold, and silver, and brass,
(b) For the building and use of the tabernacle.

And this is the offering which ye shall take of them,.... That is, some one or other of the following things were to be taken of each of them that had a heart, and it was in the power of their hands to give; it was not expected that something of each of these should be had of everyone, but every man was to give, and it was to be received of him, what of these would suit him best to bestow, some one thing, some another, as they were possessed of, and had a heart to give; and for which service many of them were abundantly supplied with what they had brought out of Egypt; and as it was the Lord that gave them favour in the eyes of the Egyptians to lend or give them the riches they had, they were under the greater obligation to part with somewhat of it freely for his service; and especially as it would be to the spiritual profit and advantage both of them and theirs:
gold and silver, and brass; "gold", for those things that were to he made of gold; as the mercy seat and cherubim, the candlestick, &c. or were covered with it, as the ark, the shewbread table, and other things; and silver, for those that were made of that, as the silver sockets to the boards of the tabernacle, the silver trumpets, &c. and "brass" for the altar of burnt offering, its pans, shovels, basins, rings, and staves, and other things: Aben Ezra rightly observes, that no mention is made of iron, there being no use of that for anything in the tabernacle to be made of it; as also there was not in the temple of Solomon, and where there was not so much as a tool of iron heard in it while it was building, 1-Kings 6:7 it may be, because instruments of war, slaughtering weapons, were made of iron; and to show that God is the God of peace in his sanctuary, and so in all the churches: gold and silver vessels the Israelites borrowed or begged of the Egyptians, and brought them with them when they came out of Egypt, Exodus 11:2.

this is the offering which ye shall take of them--the articles of which the offerings should consist.
brass--rather copper, brass being a composite metal.