'Ancestor' in the Bible

the oath that he swore to our ancestor Abraham. This oath grants

Surely you're not greater than our ancestor Jacob, are you? For he gave us this well and drank from it himself, along with his sons and his livestock."

What then shall we say that Abraham, our ancestor according to the flesh, has discovered regarding this matter?

Not only that, but when Rebekah had conceived children by one man, our ancestor Isaac --

For he was still in his ancestor Abraham's loins when Melchizedek met him.