Matthew 23:20-22

20Remember this: Somebody may make a promise by the name of the altar. Then he is making a promise by God's name. The altar as well as all the gifts on it are special to God.

21Also, somebody may make a promise by the name of the temple. Then he is making a promise in the name of God, who lives there.

22Or somebody may make a promise by heaven. Then he is making a promise by the place where God sits and rules. So he is making a promise by the name of God himself.