Ziyad Ansari says that I asked Hazrat Ubayy bin Ka'b (may Allah be pleased with him) that if all the noble wives of the Prophet (peace and blessings be upon him) had passed away, would it have been permissible for the Prophet (peace and blessings be upon him) to marry another woman? Hazrat Ubayy (may Allah be pleased with him) replied, "Who has made it forbidden?" I said, "Allah Almighty says, 'It is not lawful for you to marry women after this.'" He replied, "Several types of women were made lawful for the Prophet (peace and blessings be upon him)."