¹⁶ I will bless her and will surely give you a son by her.^(A) I will bless her so that she will be the mother of nations;^(B) kings of peoples will come from her.”

¹⁹ Without weakening in his faith, he faced the fact that his body was as good as dead^(A)—since he was about a hundred years old^(B)—and that Sarah’s womb was also dead.^{(C) 20} Yet he did not waver through unbelief regarding the promise of God, but was strengthened^(D) in his faith and gave glory to God,^(E)

⁷ Nor because they are his descendants are they all Abraham’s children. On the contrary, “It is through Isaac that your offspring will be reckoned.”^{[a](A) 8} In other words, it is not the children by physical descent who are God’s children,^(B) but it is the children of the promise who are regarded as Abraham’s offspring.^{(C) 9} For this was how the promise was stated: “At the appointed time I will return, and Sarah will have a son.”^[b](D)