Cross reference
Genesis 21:24
24 Abraham said, "I will swear."
Genesis 14:13
13 One who had escaped came and told Abram, the Hebrew. Now he lived by the oaks of Mamre, the Amorite, brother of Eshcol, and brother of Aner; and these were allies of Abram.
Romans 12:18
18 If it is possible, as much as it is up to you, be at peace with all men.
Hebrews 6:16
16 For men indeed swear by a greater one, and in every dispute of theirs the oath is final for confirmation.