Dua when visiting the graves

السَّلامُ عَلَيْكُمْ أَهْلَ الدِّيَارِ مِنَ الْمُؤْمِنِينَ
وَالْمُسْلِمِينَ ، وَإِنَّا إِنْ شَاءَ اللهُ بِكُمْ لَلَاحِقُونَ ،
نَسْأَلُ اللهَ لَنَا وَلَكُمُ الْعَافِيَةَ
Translation
"Peace be upon you all, O inhabitants of the dwellings (i.e. the
graves), amongst the believers and the Muslims. Indeed we are, Allah
willing, soon to follow (to die also), we ask Allah for well-being for
us and for you."
Note:
* The term (Muslims) here means all Muslims whether they are righteous
or evildoers, while believers or Mu'min only indicates to the
righteous only among the Muslims. This must be the case in all
occurrences of Muslim and Mu'min (believer) when they are mentioned
together in one place.
Transliteration
as-salaamu ‛alaykum ahl-ad-diyaari mi-nal-mu'mineena wal-muslimeena,
wa in-naa in shaa'-allaahu la-laaḥiqoona, nas'al-ullaaha lanaa
wa-lakumul-‛aafiyah
Sources: Muslim No# 975; An-Nasa'i No# 2040; Ibn Majah No# 1547