21 I took your sin, the calf which you had made, and burnt it with fire, and stamped it, grinding it very small, until it was as fine as dust: and I cast its dust into the brook that descended out of the mountain.
*Minor differences ignored. Grouped by changes, with first version listed as example.
I took your sin, the calf which ye had made - See this fully explained Exodus 32:20 (note).
And I took your sin, the calf which ye had made, and burnt it with fire, and stamped it, [and] ground [it] very small, [even] until it was as small as dust: and I cast the dust thereof into the brook that descended out of the (m) mount.
(m) Horeb, or Sinai.
And I took your sin, the calf which ye had made,.... Which was the object of their sin, which lay in making and worshipping it; see Isaiah 31:7.
and burnt it with fire, and stamped it; with his feet after it was burnt, to bring it into small pieces:
and ground it very small; or, as the Targum of Jonathan,"ground it in a mortar well;''the burnt and broken pieces:
even until it was as small as dust; being ground to powder, as in Exodus 32:20.
and I cast the dust thereof into the brook that descended out of the mount; and made the children of Israel to drink of it, as in the previously mentioned place; See Gill on Exodus 32:2; all this was done before the prayer for Aaron and the people.
I cast the dust thereof into the brook that descended out of the mount--that is, "the smitten rock" (El Leja) which was probably contiguous to, or a part of, Sinai. It is too seldom borne in mind that though the Israelites were supplied with water from this rock when they were stationed at Rephidim (Wady Feiran), there is nothing in the Scripture narrative which should lead us to suppose that the rock was in the immediate neighborhood of that place (see on Exodus 17:5). The water on this smitten rock was probably the brook that descended from the mount. The water may have flowed at the distance of many miles from the rock, as the winter torrents do now through the wadies of Arabia-PetrÃ&brvbr;a (Psalm 78:15-16). And the rock may have been smitten at such a height, and at a spot bearing such a relation to the Sinaitic valleys, as to furnish in this way supplies of water to the Israelites during the journey from Horeb by the way of mount Seir and Kadesh-barnea (Deuteronomy 1:1-2). On this supposition new light is, perhaps, cast on the figurative language of the apostle, when he speaks of "the rock following" the Israelites (1-Corinthians 10:4) [WILSON, Land of the Bible].
Into the brook - That there might be no monument or remembrance of it left.
*More commentary available at chapter level.