Deuteronomy 15:17-19 New International Version - UK (NIVUK)
17 then take an awl and push it through his ear lobe into the door, and he will become your servant for life. Do the same for your female servant.
18 Do not consider it a hardship to set your servant free, because their service to you these six years has been worth twice as much as that of a hired hand. And the Lord your God will bless you in everything you do.
The firstborn animals
19 Set apart for the Lord your God every firstborn male of your herds and flocks. Do not put the firstborn of your oxen to work, and do not shear the firstborn of your sheep.