I was sitting with the Prophet ﷺ when a man asked him, "If I touch my private part, or if a man touches his private part during prayer, must he perform ablution?"The Prophet ﷺ replied, "No, it is only a part of you."
قال حدثنا موسى بن داود حدثنا محمد بن جابر
كنت جالسا عند النبي ﷺ فسأله رجل فقال مسست ذكري أو الرجل يمس ذكره في الصلاة عليه الوضوء قال لا إنما هو منك
No references are available.
Its chain of transmission is hasan. It has already appeared at 16238.