Sahih Muslim | Book 7 | Chapter 31

Narrated by Ibn Abbas
Ibn Abbas reported that Mu'awiya had said to them: Do you know that I clipped some hair from the head of Allah's Messenger (may peace be upon him) at al-Marwa with the help of a clipper? I said: I do not know it except as it verdict against you.

Narrated by Ibn Abbas (Allah be pleased with him)
Ibn Abbas (Allah be pleased with him) reported that Mu'awiya b. Abu Safyin had told him: I clipped the hair (from the head of) Allah's Messenger (may peace he upon him) with a clipper while he was at al-Marwa, or I saw him getting his hair clipped with a clipper as he was at al-Marwa.1722