Exodus 22:28-30 New Revised Standard Version (NRSV)
28 You shall not revile God, or curse a leader of your people.
29 You shall not delay to make offerings from the fullness of your harvest and from the outflow of your presses.[a]
The firstborn of your sons you shall give to me. 30 You shall do the same with your oxen and with your sheep: seven days it shall remain with its mother; on the eighth day you shall give it to me.