The word of the Lord was spoken to Abram in a vision, ‘Have no fear, Abram, I am your shield; your reward will be very great.’ ‘My Lord,’ Abram replied ‘what do you intend to give me? I go childless...’ Then Abram said, ‘See, you have given me no descendants; some man of my household will be my heir.’ And then this word of the Lord was spoken to him, ‘He shall not be your heir; your heir shall be of your own flesh and blood.’ Then taking him outside he said, ‘Look up to heaven and count the stars if you can. Such will be your descendants’ he told him. Abram put his faith in the Lord, who counted this as making him justified.

The Lord dealt kindly with Sarah as he had said, and did what he had promised. So Sarah conceived and bore a son to Abraham in his old age, at the time God had promised. Abraham named the son born to him Isaac, the son to whom Sarah had given birth.