Al-Zuhri narrated from Urwah that he heard Marwan say: Busrah bint Safwan (may Allah be pleased with her) told me; she said: I heard the Messenger of Allah (peace and blessings be upon him) say: "Whoever touches his private part, let him perform ablution."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 20856