Explanation of Riyad al-Salihin-87a

The reader: In the name of Allah, the Most Gracious, the Most Merciful.
Praise be to Allah, Lord of the worlds, and may peace and blessings be upon our Prophet Muhammad, and upon his family and all his Companions.
He (may Allah have mercy on him) said: "Chapter on the prohibition of wailing over the deceased
It was narrated from 'Umar ibn al-Khattab (may Allah be pleased with him) that he said: The Prophet (peace and blessings be upon him) said:

The dead is punished in the grave because of wailing on it.

الميت يعذب في قبره بما نيح عليه

Sahih Muslim 927b

And in another narration:

for what is wailed over him

ما نيح عليه

Agreed upon by al-Bukhari and Muslim
And it was narrated from Ibn Mas'ud (may Allah be pleased with him) that he said: The Messenger of Allah (peace and blessings be upon him) said:

He is not one of us who strikes his cheeks, rends his garment, and calls the calls of the Jahiliyyah.

ليس منا من ضرب الخدود وشق الجيوب ودعا بدعوى الجاهلية

Sunan an-Nasa'i 1862Sahih (Darussalam)

Agreed upon by al-Bukhari and Muslim
And it was narrated from Abu Burdah that he said: Abu Musa fell ill and fainted, and his head was in the lap of a woman from his family. "

The Shaykh : In the name of Allah, the Most Gracious, the Most Merciful.
The author (may Allah have mercy on him) said in his book *Riyad al-Saliheen*: "Chapter on the prohibition of wailing over the deceased"
Wailing is crying, crying over the deceased with a moaning sound, as a pigeon moans. Crying over the deceased is of two types:
One type is what nature dictates, and there is nothing wrong with this, and the servant is not blamed for it. Among this is what happened to the Prophet (peace and blessings be upon him and his family) out of mercy for this boy who was struggling with death