Deuteronomy 15:17 in the World English Bible
then you shall take an awl, and thrust it through his ear to the door, and he shall be your servant forever. Also to your female servant you shall do likewise.
Context
16 And it shall be, if he say unto thee, I will not go away from thee; because he loveth thee and thine house, because he is well with thee;
17 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.
18 It shall not seem hard unto thee, when thou sendest him away free from thee; for he hath been worth a double hired servant to thee, in serving thee six years: and the LORD thy God shall bless thee in all that thou doest.