'Swore' in the Bible

Now the angel of the LORD went up from Gilgal to Bochim. And he said, "I brought you up from Egypt, and brought you into the land which I swore to give to your fathers. I said, 'I will never break my covenant with you,

But we cannot give them wives from our daughters." (For the {Israelites} swore, saying, "Cursed be [anyone] who gives a wife to Benjamin.")