´It was narrated from 'Ali bin Abu Talib that:` The Prophet said: "Whoever leaves an area the size of a hair on his body and does not cleanse it from sexual impurity, such and such will be done to him in the Fire." 'Ali said: "Because of that I am hostile towards my hair," and he used to shave his head.
Hadith Referenceسنن ابن ماجه / أبواب التيمم / 599
Hadith Gradingالألبانی:ضعيف | زبیر علی زئی:إسناده حسن
Hadith Takhrij« سنن ابی داود/الطہارة 98 ( 249 ) ، ( تحفة الأشراف : 10090 ) ، وقد أخرجہ : مسند احمد ( 1/94 ، 101 ، 133 ) ، سنن الدارمی/الطہارة 69 ( 778 ) ( ضعیف ) » ( سند میں عطاء بن سائب ضعیف ہیں )
1؎: Because when the hair is long, there often remains the possibility that perhaps the entire head has not been wetted, and some spot may have remained dry. Ali (radi Allahu anhu) used to trim the hair. Cutting the hair is superior to shaving the entire head, but during Hajj, shaving the whole head is superior.
Explanation & Benefits
Maulana Ataullah Sajid
Commentary: Keeping the hair of the head is indeed preferable, provided that it is not in the English (Western) style, but rather parted hair. However, shaving the hair off is also permissible.
Source: Commentary on Sunan Ibn Mājah by Mawlānā ‘Atā’ullāh Sājid, Page: 599
Narrated Ali ibn Abu Talib: The Messenger of Allah ﷺ said: If anyone who is sexual defiled leaves a spot equal to the breadth of a hair without washing, such and such an amount of Hell-fire will have to be suffered for it. Ali said: On that account I treated my head (hair) as an enemy, meaning I cut my hair. He used to cut the hair (of his head). May Allah be pleased with him.
Shaykh Umar Farooq Saeedi
Benefits and Issues: ➊ From the collection of the aforementioned narrations, it is clear that in the ritual bath (ghusl) of major impurity (janabah), a person should carefully and diligently ensure that water reaches every part of the entire body; even a hair’s breadth left dry is a cause of punishment. However, women are given a legal concession in Shari‘ah that they do not have to undo their braids, as will be mentioned ahead.
Source: Sunan Abu Dawood – Commentary by Shaykh Umar Farooq Saeedi, Page: 249