Sahih Muslim — The Book of Drinks — Hadith No: 5340

Thauban, the freed slave of the Messenger of Allah (ﷺ) reported Allah's Messenger (ﷺ) as saying:He who offered prayer for the dead, for him is the reward of one qirat, and he who attended its burial, he would have two qirats as his reward. And qirat is equivalent to Uhud

It is narrated on the authority of Abu Huraira that a dark-complexioned woman (or a youth) used to sweep the mosque. The Messenger of Allah (ﷺ) missed her (or him) and inquired about her (or him). The people told him that she (or he) had died. He asked why they did not inform him, and it appears as if they had treated her (or him) or her (or his) affairs as of little account. He (the Holy Prophet) said:Lead me to her (or his) grave. They led him to that place and he said prayer over her (or him) and then remarked: Verily, these graves are full of darkness for their dwellers. Verily, the Mighty and Glorious Allah illuminates them for their occupants by reason of my prayer over them

Amir b. Sa'd b. Abu Waqqas told that Sa'd b. Abu Waqqas said during his illness of which he died:" Make a niche for me in the side of the grave and set up bricks over me as was done in case of Allah's Messenger (ﷺ)

Abu'l-Hayyaj al-Asadi told that 'Ali (b. Abu Talib) said to him:Should I not send you on the same mission as Allah's Messenger (ﷺ) sent me? Do not leave an image without obliterating it, or a high grave without levelling It. This hadith has been reported by Habib with the same chain of transmitters and he said: (Do not leave) a picture without obliterating it