Deuteronomy 15:17-19 New English Translation (NET Bible)
17 you shall take an awl and pierce a hole through his ear to the door.[a] Then he will become your servant permanently (this applies to your female servant as well). 18 You should not consider it difficult to let him go free, for he will have served you for six years, twice[b] the time of a hired worker; the Lord your God will bless you in everything you do.
Giving God the Best
19 You must set apart[c] for the Lord your God every firstborn male born to your herds and flocks. You must not work the firstborn of your bulls or shear the firstborn of your flocks.