15 And the angel of the Lord called to Abraham a second time from heaven, 16 and said, “By myself I have sworn, says the Lord, because you have done this, and have not withheld your son, your only son, 17 I will indeed bless you, and I will multiply your descendants as the stars of heaven and as the sand which is on the seashore. And your descendants shall possess the gate of their enemies, 18 and by your descendants shall all the nations of the earth bless themselves, because you have obeyed my voice.”