Because ye were glad, because ye rejoiced, O ye destroyers of mine heritage, because ye are grown fat as the heifer at grass, and bellow as bulls;
Because ye were glad ... ye rejoiced, O ye destroyers of mine heritage - (Isaiah 47:6, "I was wroth with my people, I have polluted mine inheritance, and given them into thine hand; thou didst show them no mercy").
Because ye are grown fat - and so skip wantonly.
As the heifer at grass - fat and frisky. [But there is a disagreement of gender in the Hebrew reading, thus daashaa' (H1876), grazing, or 'at grass,' does not agree with kª`eglaah, a heifer.] The reading х daashaah (H1877), the feminine participle of duwsh (H1758), to thresh] is better, 'a heifer threshing;' the strongest were used for threshing, and, as the law did not allow their mouth to be muzzled in threshing (Deuteronomy 25:4), they waxed wanton with eating. Bellow as bulls - rather, 'neigh as steeds,' literally, "strong ones," a poetical expression for steeds (note, Jeremiah 8:16). (Maurer.)