1 Samuel 12:6

And Samuel, in order to have the people realize still more deeply their ingratitude in rejecting a government which they themselves acknowledged as having been so praiseworthy, said unto the people, It is the Lord, He is witness, that advanced Moses and Aaron, made them what they were, gave them their place in history, and that brought your fathers up out of the land of Egypt. He had heard their declaration. which implied that they had, in the person of Samuel, who represented this covenant God, rejected Jehovah Himself, as Samuel now proceeds to show from their history.