'Swear by the Lord' in the Bible

And I will make you swear by the LORD, the God of heaven, and the God of the earth, that you shall not take a wife unto my son of the daughters of the Canaanites, among whom I dwell:

Now therefore arise, go forth, and speak kindly unto your servants: for I swear by the LORD, if you go not forth, there will not tarry one with you this night: and that will be worse unto you than all the evil that befell you from your youth until now.

And the king sent and called for Shimei, and said unto him, Did I not make you to swear by the LORD, and admonished you, saying, Know for a certain, on the day you go out, and travel anywhere, that you shall surely die? and you said unto me, The word that I have heard is good.

And those that worship the host of heaven upon the housetops; and those that worship and that swear by the LORD, and yet swear by Milcom;