For men indeed swear by the greater, and an oath for confirmation is for them an end of all dispute.
Hebrews 6:16
Surrounding context
6:15 And so, after he had patiently endured, he obtained the promise.
6:16 For men indeed swear by the greater, and an oath for confirmation is for them an end of all dispute.
6:17 Thus God, determining to show more abundantly to the heirs of promise the immutability of His counsel, confirmed it by an oath,