Muwatta' Malik 20-7

Translation

Yahya related to me from Malik from Nafi that Abdullah ibn Umar would never wash his head while he was in ihram except if he had to do ghusl because of a wet dream. Malik said, "I have heard the people of knowledge say that there is no harm in someone who is in ihram rubbing his head with certain kinds of plants after he has stoned the Jamrat al-Aqaba but before he has shaved his head, because once he has finished stoning the Jamrat al-Aqaba it is halal for him to kill lice, to shave his head, to clean himself of body hair, and to wear normal clothes."

Grades by grader

Narrators

1. 1
   ʿAbdullāh b. ʿUmar b. al-Khaṭṭāb

   One of the Companions who narrated most often, and one of the ʿAbādilah; he was among the people most strict in following the narrations (athar).d. 72 AH, or 73 AH, or 74 AH, also said: 75 AH
   عَبْدُ اللهِ بْنُ عُمَرَ بْنِ الْخَطَّابِأحد المكثرين من الصحابة والعبادلة ، وكان من أشد الناس اتباعا للأثر
   أن
2. 2
   Nāfiʿ mawlá Ibn ʿUmar

   trustworthy (thiqah), reliable (thabt), a well-known jurist (faqīh)d. 116 AH, or 117 AH, or 118 AH, or 119 AH, or 120 AH
   نَافِعٍثقة ثبت فقيه مشهور
   عن
3. 3
   Mālik b. Anas

   The jurist (al-faqīh), the Imam of the Abode of Migration (Imām Dār al-Hijrah), the head of the proficient masters, and the foremost among the meticulous.d. 178 AH, or 179 AH
   مَالِكٌالفقيه ، إمام دار الهجرة ، رأس المتقنين ، وكبير المتثبتين

Who each narrator was and how reliable, from hdith.com

Latin names and English verdicts with a dotted underline are machine translations, not reviewed.