'Cannot' in the Bible

And when he saw her, he rent his clothes, and said, "Alas, my daughter! you have brought me very low, and you have become the cause of great trouble to me; for I have opened my mouth to the LORD, and I cannot take back my vow."

but if you cannot tell me what it is, then you shall give me thirty linen garments and thirty festal garments." And they said to him, "Put your riddle, that we may hear it."

Yet we cannot give them wives of our daughters." For the people of Israel had sworn, "Cursed be he who gives a wife to Benjamin."