Exodus 22:29-31 English Revised Version (ERV)

29. Thou shalt not delay to offer of the abundance of thy fruits, and of thy liquors. The firstborn of thy sons shalt thou give unto me.

30. Likewise shalt thou do with thine oxen, and with thy sheep: seven days it shall be with its dam; on the eighth day thou shalt give it me.

31. And ye shall be holy men unto me: therefore ye shall not eat any flesh that is torn of beasts in the field; ye shall cast it to the dogs.

Exodus 22