佛說目連問戒律中五百輕重事經 2.44

2.44

問：「比丘畜奴牛驢馬，犯何事？」答：「犯捨墮。不悔轉增。」

Question: "If a bhikṣu keeps slaves, cattle, donkeys, or horses, what offense is committed?"
Answer: "He commits a naiḥsargika-pāyattika offense. If he does not repent, it progressively increases."