Exodus 4:8

4:8 “If they do not believe you or pay attention to the former sign, then they may believe the latter sign.

Exodus 12:44

12:44 But everyone’s servant who is bought for money, after you have circumcised him, may eat it.

Exodus 30:30

30:30 “You are to anoint Aaron and his sons and sanctify them, so that they may minister as my priests.