Bismillahirrahmanirrahim 
 
Hadith:  Whoever touches his penis, he should not perform Salah until he performs Wudu
 
It was narrated from Busrah bint Safwan Radi-Allahu-Anha that the Prophet Peace be upon him  said: If any one of you touches his private part with his hand, let him perform Wudu
Sunan Nasaii, Vol 1, 446 -Sahih
 
It was narrated from Busrah bint Safwan Radi Allahu Anhu that the Prophet Sallallahu Alaihi Wasallam said: Whoever touches his penis, he should not perform Salah until he performs Wudu
Sunan Nasaii, Vol. 1, Book 4, 448-Sahih