Riyad as-Salihin: The Book of Miscellany – Hadith No. 1799 — Buraidah (May Allah be pleased with him) reported: The Prophet (ﷺ) used to… (Hadith No. 1799)

Buraidah (May Allah be pleased with him) reported: The Prophet (ﷺ) used to teach them (i.e., the Companions) whenever they came out to visit the graveyard to say: "As-salamu 'alaikum ahlad-diyyari minal- Mu'minina wal-Muslimina, wa inna in sha' Allahu bikum lahiqun. As 'alul-laha lana wa-lakumul- 'afiyyah (May you be safe, O inmates of the abodes of the believers and the Muslims, and if Allah pleases, we shall follow you, we pray to Allah for well-being for ourselves and for you).".

Explanation:

Reference: Riyad as-Salihin, The Book of Miscellany, Hadith No. 1799