Exodus 22:28-31 - Regulations Regarding Tribute And Holiness
28 "You are not to blaspheme God or curse a ruler of your people.
29 "You are not to hold back the fullness of your harvest and the outflow of your wine presses. You are to give to me the firstborn of your sons. 30 You are to do the same with your oxen and your sheep. They shall be with their mother for seven days and then on the eighth day you are to give them to me.
31 "You are to be people set apart for me. You are not to eat flesh torn apart in the field; you are to throw it to the dogs."