Deuteronomy 15:17

then you shall take an awl and pierce his ear, at the door of your house. And he shall serve you even forever. You shall also act similarly toward your woman servant

Other versions

King James Version

Then thou shalt take an aul, and thrust it through his ear unto the door, and he shall be thy servant for ever. And also unto thy maidservant thou shalt do likewise.

English Standard Version

then you shall take an awl, and put it through his ear into the door, and he shall be your slave forever. And to your female slave you shall do the same.

New International Version

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 maidservant.