I will certainly return unto thee, and visit thee according to the time of life That is, nine months hence, and, in fulfilment of my promise, Sarah shall have a son. God will return to those that bid him welcome.
Related Commentaries of Genesis 18:10
Genesis 18:10
10 And he said, I will certainly return unto thee according to the time of life; and, lo, Sarah thy wife shall have a son. And Sarah heard it in the tent door, which was behind him.