Genesis 18:10; Genesis 21:2; Galatians 4:23; Galatians 4:28

10 The Lord said, I will surely return to you uabout this time next year, and vSarah your wife shall have a son. And Sarah was listening at the tent door behind him.

And Sarah mconceived and bore Abraham a son in his old age nat the time of which God had spoken to him.

23 But gthe son of the slave was born according to the flesh, while hthe son of the free woman was born through promise.

28 Now you,1 brothers, mlike Isaac, nare children of promise.