“For when God made promise to Abraham, because he could swear by no greater, he sware by himself,”
King James Version (KJV)
6:13 For - Ye have abundant encouragement, seeing no stronger promise could be made than that great promise which God made to Abraham, and in him to us.
Heb 6:13 For when God made promise to Abraham. The promises are absolutely sure. See how God confirmed his promise to Abraham! See Ge 22:15-18.