Nasai

1862. Commentary:
➊ Some scholars have also interpreted the meaning of "salq" as striking the cheeks.
➋ Although the family members wept at the unconsciousness of Abu Musa radi Allahu anhu, he feared that they would also weep in this manner upon his death; therefore, he admonished them... radi Allahu anhu wa ardah.

1864. Commentary: Shaving those hairs which it is permissible to shave, for example: the hair of the head, is also impermissible as a form of mourning. And those hairs which it is impermissible to shave, for example: the beard and eyebrows, then shaving them for mourning is even more strictly impermissible. In reality, the intent of the Shari‘ah is that a person may be affected by calamities, but not to such an extent that human dignity is injured or lost; humanity should remain intact. The aforementioned acts are against human dignity, therefore they are prohibited. However, tears flowing involuntarily from the eyes, and likewise expressing grief, are permissible because these are natural things. In fact, if even these natural expressions do not occur at such times, it means that the person is devoid of natural mercy, and indifference to nature (whether by disposition or by affectation) is contrary to humanity.

Hadith Commentary:
Vocabulary of the Hadith:
:
(1)
Ṣāliqah or Sāliqah:
A woman who screams and wails due to calamity and distress; derived from "ṣalq," meaning a loud and harsh voice.
(2)
Al-Ḥāliqah:
A woman who shaves her head due to calamity and distress.
(3)
Ash-Shāqqah:
A woman who tears her clothes due to grief and sorrow.

Benefits and Issues:
Screaming and wailing, tearing clothes, and shaving the head out of grief and sorrow are customs of the Age of Ignorance (Jāhiliyyah). The Shariah abolishes these wrongful practices, which are contrary to patience, forbearance, and expressing contentment with Allah’s decree. Committing these evil customs is a sign of being distant from the religion and Shariah, from which a Muslim should abstain.

Benefits and Issues:

➊
The excellence of the piety of the noble Companions (radi Allahu anhum ajma'in) is such
that even in the state of severe illness, they remained mindful of enjoining good and forbidding evil (amr bil-ma'ruf wa nahi 'anil-munkar).

➋
If any wrong action occurs in the home, it should be immediately objected to.

➌
In the era of ignorance (jahiliyyah), people used to shave their heads as an expression of grief.
Nowadays, some people who are accustomed to shaving their beards
stop shaving on occasions of grief.
One problem with this is that, in a sense, it is also an imitation of the people of ignorance (ahl al-jahiliyyah).
The second problem is that the Sunnah of the Messenger of Allah (sallallahu alayhi wa sallam)—that is, keeping the beard—has been linked to grief.
Whereas the beard is not only the Sunnah of the Prophet (sallallahu alayhi wa sallam) but also the Sunnah of all the noble Prophets (alayhim as-salam).
Therefore, it has been counted among the natural practices (umoor fitrah).
Which have been commanded in all the revealed laws (shari'ahs).
See: (Sunan Ibn Majah, Hadith: 293)
Similarly, wearing black clothing as an expression of grief is also an imitation of the disbelievers (kuffar).
Whereas in the religion of Islam, adopting resemblance to the disbelievers is forbidden (haram).