And Abraham said, I will swear.
Genesis 14:13
Then a fugitive came and told Abram the Hebrew. Now he was living by the oaks of Mamre the Amorite, brother of Eshcol and brother of Aner, and these were allies with Abram.
Romans 12:18
If possible, so far as it depends on you, be at peace with all men.
Hebrews 6:16
For men swear by one greater [than themselves], and with them an oath [given] as confirmation is an end of every dispute.