'Swear by God' in the Bible

and also, against king Nebuchadnezzar he hath rebelled, who had caused him to swear by God, and he hardeneth his neck, and strengtheneth his heart, against turning back unto Jehovah, God of Israel.

And I strive with them, and declare them vile, and smite certain of them, and pluck off their hair, and cause them to swear by God, 'Ye do not give your daughters to their sons, nor do ye take of their daughters to your sons, and to yourselves.