'Forefather' in the Bible

He will be great and He will be called 'Son of the Most High.' And the Lord God will give Him the throne of His forefather David;

The oath which He swore to Abraham our forefather,

Live lives which shall prove your change of heart; and do not begin to say to yourselves, 'We have Abraham as our forefather,' for I tell you that God can raise up descendants for Abraham from these stones.