John Gills Exposition of the Bible Commentary - Exodus 32:5
And when Aaron saw it ,.... In what form it was, and what a figure it made, and how acceptable it was to the Israelites. The Targums of Jonathan and Jerusalem paraphrase it,"and Aaron saw Hur slain before him;'for reproving them for their idolatry, as the Midrash F5 So Pirke Eliezer, c. 45. , quoted by Jarchi, says: and Aaron fearing they would take away his life if he opposed them: he built an altar before it ; that sacrifice might be offered on it to it: and Aaron made... read more
Matthew Henry's Complete Commentary - Exodus 32:1-6
While Moses was in the mount, receiving the law from God, the people had time to meditate upon what had been delivered, and prepare themselves for what was further to be revealed, and forty days was little enough for that work; but, instead of that, there were those among them that were contriving how to break the laws they had already received, and to anticipate those which they were in expectation of. On the thirty-ninth day of the forty, the plot broke out of rebellion against the Lord.... read more