'Swear to Me' in the Bible

Now swear to me right here in God's name that you will not deceive me, my children, or my descendants. Show me, and the land where you are staying, the same loyalty that I have shown you."

Jacob said, "Swear to me that you will do so." So Joseph gave him his word. Then Israel bowed down at the head of his bed.

So now swear to me in the Lord's name that you will not kill my descendants after me or destroy my name from the house of my father."

David said to him, "Can you take us down to this raiding party?" He said, "Swear to me by God that you will not kill me or hand me over to my master, and I will take you down to this raiding party."