'Forsaken the Lord' in the Bible

And though the army of Syria came with a small company of men, yet the LORD delivered a very great host into their hands, because they had forsaken the LORD God of their fathers. And thereto they served Joash according.

For Pekah the son of Remaliah slew in Judah a hundred and twenty thousand in one day, and all fighting men: and that because they had forsaken the LORD God of their fathers.