Luke 1:13-20
but the angel said to him, "Fear not, Zechariah, your prayer has been heard; your wife Elizabeth will bear a son to you, and you must call his name John.
Romans 9:6-9
It is not, of course, as if God's word had failed! Far from it! 'Israel' does not mean everyone who belongs to Israel;
Galatians 4:28-31
Now you are the children of the Promise, brothers, like Isaac;
Treasury of Scripture Knowledge
Summary
And God said, Sarah thy wife shall bear thee a son indeed; and thou shalt call his name Isaac: and I will establish my covenant with him for an everlasting covenant, and with his seed after him.
General references
Bible References
General references
Luke 1:55
as he promised our fathers, to have mercy on Abraham and his offspring for ever."