Albert Barnes Commentary Job 21:10

"Their bull gendereth, and faileth not; Their cow calveth, and casteth not her calf." — Job 21:10 (ASV)

Their bull gendereth - See Rosenmuller and Lee on Job 21:10; compare Bochart, Hieroz. P. 1, Lib. ii. c. xxx. The general idea is, that the wicked were prospered as well as the pious. God did not interpose by a miracle to cut off their cattle, and to prevent their becoming rich.