'Forefather' in the Bible

who by the Holy Spirit, through the mouth of our father David, Your servant, said,‘Why did the nations (Gentiles) become arrogant and rage,And the peoples devise futile things [against the Lord]?

And he answered, “Brothers and fathers, listen to me! The God of glory [the Shekinah, the radiance of God] appeared to our father Abraham when he was in Mesopotamia, before he lived in Haran,