'God of Their Fathers' in the Bible

But they acted treacherously against the God of their fathers and played the prostitute with the gods of the peoples of the land, whom God had destroyed before them.

Then David said to all the assembly, “Now bless (praise, thank) the Lord your God.” And all the assembly blessed the Lord, the God of their fathers, and bowed down and honored the Lord and to the king [as His earthly representative].