Cross reference
Genesis 21:24
24 And Abraham said, I will swear.
Genesis 14:13
13 And there came one that had escaped, and told Abram the Hebrew: now he dwelt by the oaks of Mamre, the Amorite, brother of Eshcol, and brother of Aner; and these were confederate with Abram.
Romans 12:18
18 If it be possible, as much as in you lieth, be at peace with all men.
Hebrews 6:16
16 For men swear by the greater: and in every dispute of theirs the oath is final for confirmation.