'Swear by God' in the Bible

And also he rebelled against king Nebuchadnezzar who caused him to swear by God: and he will harden his neck and strengthen his heart from turning back to Jehovah the God of Israel.

And I shall contend with them, and I shall curse them and I shall strike of them men, and I shall make them bald, and cause them to swear by God, If ye shall give your daughters to their sons, and if ye shall lift up from their daughters to your sons and to yourselves.