'Swear by the Lord' in the Bible

and I will make you swear by the Lord, the God of heaven and the God of earth, that you shall not take a wife for my son from the daughters of the Canaanites, among whom I live,

Now therefore arise, go out and speak kindly to your servants, for I swear by the Lord, if you do not go out, surely not a man will pass the night with you, and this will be worse for you than all the evil that has come upon you from your youth until now.”

So the king sent and called for Shimei and said to him, “Did I not make you swear by the Lord and solemnly warn you, saying, ‘You will know for certain that on the day you depart and go anywhere, you shall surely die’? And you said to me, ‘The word which I have heard is good.’