'Fathers' in the Bible

Have we not all one father? has not one God made us? why are we, every one of us, acting falsely to his brother, putting shame on the agreement of our fathers?

From the days of your fathers you have been turned away from my rules and have not kept them. Come back to me, and I will come back to you, says the Lord of armies. But you say, How are we to come back?

And by him the hearts of fathers will be turned to their children, and the hearts of children to their fathers; for fear that I may come and put the earth under a curse.