'Swear' in the Bible

And I will bring you in unto the land, concerning the which I did swear to give it to Abraham, to Isaac, and to Jacob; and I will give it you for an heritage: I am the LORD.

Moses took the bones of Joseph with him, because Joseph had made the Israelites swear a solemn oath, saying, “God will certainly come to your aid; then you must take my bones with you from this place.”

Remember Abraham, Isaac, and Israel, Your servants to whom You swore by Yourself, and said to them, ‘I will multiply your descendants as the stars of the heavens, and all this land of which I have spoken I will give to your descendants, and they shall inherit it forever.’”