Chapter: It is permissible for the pilgrim performing Umrah to shorten his hair and he does not have to shave it. It is recommended for him to shave his hair or shorten it at Al-Marwah
Ibn Abbas (RA) reported that Mu'awiyah had said to them: Do you know that I clipped some hair from the head of Allah's Messenger (ﷺ) at al- Marwah with the help of a clipper? I said: I do not know it except as it verdict against you.
Ibn Abbas (RA) reported that Mu'awiyah bin 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-Marwah, or I saw him getting his hair clipped with a clipper as he was at al-Marwah. 1722
Abu Sa'id (RA) reported: We went out with Allah's messenger (ﷺ) pronouncing loudly the Talbiya for Hajj. When we came to Makkah, he commanded us that we should change this (Ihram for Hajj) to that of 'Umrah except one who had brought the sacrificial animal with him. When it was the day of Tarwiya (8th of Dhu'l-Hijja) and we went to Mina, we (again) pronounced Talbiya for Hajj.
Abu Nadra reported: While I was in the company of Jabir, a person came and said: There is difference of opinion amomg Ibn Abbas (RA) and Ibn Zubair about two Mut'as (benefits, Tamattu' in Hajj and temporary marriage with women), whereupon Jabir said: We have been doing this during the lifetime of Allah's Messenger (ﷺ) , and then 'Umar forbade us to do so, and we never resorted to them.