Genesis 22:16 in the King James Version
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:
Context
15 The LORD’s angel called to Abraham a second time out of the sky,
16 and said, “‘I have sworn by myself,’ says the LORD, ‘because you have done this thing, and have not withheld your son, your only son,
17 that I will bless you greatly, and I will multiply your offspring greatly like the stars of the heavens, and like the sand which is on the seashore. Your offspring will possess the gate of his enemies.