The Birth of Isaac

21 Now the Lord was gracious to Sarah^(A) as he had said, and the Lord did for Sarah what he had promised.^{(B) 2} Sarah became pregnant and bore a son^(C) to Abraham in his old age,^(D) at the very time God had promised him.^{(E) 3} Abraham gave the name Isaac^[a](F) to the son Sarah bore him.

¹⁵ The angel of the Lord^(A) called to Abraham from heaven^(B) a second time ¹⁶ and said, “I swear by myself,^(C) declares the Lord, that because you have done this and have not withheld your son, your only son,^{(D) 17} I will surely bless you^(E) and make your descendants^(F) as numerous as the stars in the sky^(G) and as the sand on the seashore.^(H) Your descendants will take possession of the cities of their enemies,^{(I) 18} and through your offspring^[a] all nations on earth will be blessed,^[b](J) because you have obeyed me.”^(K)