Requiem aeternam dona ei, Domine.Et lux perpetua luceat ei. Requiescat in pace. Amen. Anima ejus, et animae omnium fidelium defunctorum per misericordiam Dei requiescant in pace. Amen.

(from "Rituale Romanum - De Exequiis Ordo", edition 1847) Prayer, in graveside setting. It's preceded by "Pater Noster" or "De Profundis".

Here's an english translation: Eternal peace let you present him, Lord. And an eternal light bright to him. Let he rest in peace. Let rest in peace his soul and all of those that are dead, by Lord's mercy.

Invocation: Mercy

This implement is for the blessing of those seeking mercy and are repentant. Imbued with the intelligent power of the Most High, they may be granted Divine mercy and freedom. Be advised, demons and others not following the decrees of the Book of Life, shall be brought before the Throne of God to face judgement. Holy ones only!