Albert Barnes Commentary Jeremiah 50:10-11

"And Chaldea shall be a prey: all that prey upon her shall be satisfied, saith Jehovah. Because ye are glad, because ye rejoice, O ye that plunder my heritage, because ye are wanton as a heifer that treadeth out [the grain], and neigh as strong horses;" — Jeremiah 50:10-11 (ASV)

Or, Chaldaea shall become a spoil ... for thou wast glad, thou exultedst, ye plunderers of mine heritage.

Because ye are grown fat – Rather, for you leaped, skipped as an animal does when playing.

As the heifer at grass – Or, as a heifer threshing. When threshing cattle were allowed to eat their fill (Deuteronomy 25:4), and so grew playful.

Bellow as bulls – Better as in the margin.