‘Abdullah Ibn Ja’far (RAA) narrated, ‘When we received the news of Ja’far’s death; when he was killed (in the Battle of Mu’tah), the Prophet(ﷺ) said, “Prepare some food for the family of Ja’far, for what has befallen them is keeping them preoccupied.” Related by the five lmams except for An-Nasa’i.

Source: sunnah.com · Version: urn:2050620

Sulaiman bin Buraidah narrated on the authority of his father (RAA) that the Prophet (ﷺ) taught us that when we visit graves we should say, “Peace be upon you, O believing men and women, O dwellers of this place. Certainly, Allah willing, we will join you. We supplicate to Allah to grant us and you well being.” Related by Muslim.

Source: sunnah.com · Version: urn:2050630

Ibn ‘Abbas (RAA) narrated, ‘Once the Messenger of Allah (ﷺ) passed by some graves in Madinah. He turned his face toward them saying, “Peace be upon you, O dwellers of these graves. May Allah forgive you and us. You have preceded us, and we are following your trail." Related by At-Tirmidhi, who graded it as Hasan.

Source: sunnah.com · Version: urn:2050640

A’ishah (RAA) narrated that the Messenger of Allah (ﷺ) said, “Do not speak badly of the dead, they have already seen the result of (the deeds) that they sent on before them.” Related by Al·Bukhari.

Source: sunnah.com · Version: urn:2050650

At-Tirmidhi Related a similar narration on the authority of Al-Mughirah bin Shu’bah, and he added, "Thus you will be offending the living (i.e. if you curse their dead)."

Source: sunnah.com · Version: urn:2050660