Sayyidah Busrah bint Safwan (may Allah be pleased with her) said: I heard the Messenger of Allah (peace and blessings be upon him) say: "Whoever touches his private organ, or his testicles, or his groin, let him perform the complete ablution for prayer."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 20881