Exodus 22:28-31 - Regulations Regarding Tribute And Holiness
28 You may not say evil of the judges, or put a curse on the ruler of your people.
29 Do not keep back your offerings from the wealth of your grain and your vines. The first of your sons you are to give to me. 30 In the same way with your oxen and your sheep: for seven days let the young one be with its mother; on the eighth day give it to me.
31 You are to be holy men to me: the flesh of no animal whose death has been caused by the beasts of the field may be used for your food; it is to be given to the dogs.