Genesis 22:16 And said, By myself have I sworn, saith the Lord, for because thou hast done this thing, and hast not withheld thy son, thine only son: 10 I MC VC

Hebrews 6:13 For when God made promise to Abraham, because he could swear by no greater, he sware by himself, 5 I MC VC

Hebrews 6:17 Wherein God, willing more abundantly to shew unto the heirs of promise the immutability of his counsel, confirmed it by an oath: 7 I MC VC