Musannaf Ibn Abi Shaybah 12146 — Reports on greeting the graves when

Sulayman bin Buraydah narrates from his father that the Prophet (peace and blessings be upon him) taught the Companions that when they went to the graveyard they should say: "Peace be upon you, O believing and Muslim people of this place. If Allah wills, we will join you. You have gone ahead, and we will come after you. We ask Allah for well-being for ourselves and for you."