Hazrat Urwah bin Zubair narrates that my father related to me that Marwan discussed with me the issue of touching the private part. I said that there is no (need for) ablution in this matter. He said that Busrah bint Safwan has narrated a hadith about this. Then he sent a messenger to Busrah, who came back and reported that she states that the Messenger of Allah (peace and blessings be upon him) said: Whoever touches his private part with his hand should perform ablution.