They can find grounds to annul a man's neder by [reason of] his wife's kesubah. It happened once that a person made a neder prohibiting benefit from his wife, and her kesubah was four hundred dinars. He came before R' Akiva, who obligated him to pay her kesubah to her. He said to him: “Rabbi! Father left eight hundred dinars, my brother took four hundred, and I took four hundred. Is it not enough that she should take two hundred and I, two hundred?” R' Akiva said to him: “Even if you have to sell the hair on your head, you must pay her kesubah to her.” He said to him: “Had I known that this was so, I would not have made the neder.” Thereupon, R' Akiva permitted her.