Sayyiduna Ibn Abbas (may Allah be pleased with them both) narrates that I heard the Prophet Muhammad (peace and blessings be upon him) delivering a sermon: "Beware! No man should ever be alone with a woman except in the presence of her mahram." Then a man stood up and said, "O Messenger of Allah (peace and blessings be upon him), indeed my name has been registered for such-and-such battle, while my wife has set out for Hajj." The Prophet (peace and blessings be upon him) said: "Go and perform Hajj with your wife."