Sayyidah Busrah bint Safwan (may Allah be pleased with her) said: the Messenger of Allah (peace and blessings be upon him) said: "Whoever touches his groin, or his testicles, or his private organ, let him not pray until he performs ablution."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 20886