Is anything impossible for the Lord? I will return to you when the season comes round again and Sarah will have a son.”

So Sarah became pregnant and bore Abraham a son in his old age at the appointed time that God had told him.

God said, “Let there be lights in the expanse of the sky to separate the day from the night, and let them be signs to indicate seasons and days and years,

But I will establish my covenant with Isaac, whom Sarah will bear to you at this set time next year.”