TSK · Genesis 21:24

¶ And there came one that had escaped, and told Abram the Hebrew; for he dwelt in the plain of Mamre the Amorite, brother of Eshcol, and brother of Aner: and these [were] confederate with Abram.

For men verily swear by the greater: and an oath for confirmation [is] to them an end of all strife.