The Prophet (ﷺ) said, "The deceased is tortured in his grave for the wailing done over him."

Narrated Shu'ba:

The deceased is tortured for the wailing of the living ones over him .
Sahih al-Bukhari Book 23, Hadith 50
← Previous Hadith I heard the Prophet (ﷺ) saying, "Ascribing false things to me is not like ascribing false things to anyone else. Whosoever tells a lie against me intentionally then surely let him occupy his seat in Hell-Fire." I heard the Prophet (ﷺ) saying, "The deceased who is wailed over is tortured for that wailing."

Sahih al-Bukhari Book 23, Hadith 49 Next Hadith → On the day of the Battle of Uhud, my father was brought and he had been mutilated (in battle) and was placed in front of Allah's Messenger (ﷺ) and a sheet was over him. I went intending to uncover my father but my people forbade me; again I wanted to uncover him but my people forbade me. Allah's Messenger (ﷺ) gave his order and he was shifted away. At that time he heard the voice of a crying woman and asked, "Who is this?" They said, "It is the daughter or the sister of `Amr." He said, "Why does she weep? (or let her stop weeping), for the angels had been shading him with their wings till he (i.e. the body of the martyr) was shifted away."

Sahih al-Bukhari Book 23, Hadith 51