Sunan Ibn Majah, Chapter: Chapters Regarding Funerals

"I saw the Messenger of Allah (saw) offering the funeral prayer for a man among the Ansar, and I heard him say: 'Allahumma salli 'alayhi waghfirlahu warhamhu, wa 'afihi wa'fu 'anhu, waghsilhu bi Main wa thaljin wa baradin, wa naqqihi min adh-dhunubi wal-khataya kama yunaqqath-thawbul-abyadu minad-danas, wa abdilhu bi darihi daran khayran min darihi, wa ahlan khayran min ahlili, wa qihi fitnatal-qabri wa 'adhaban-nar. (O Allah, send blessing upon him, forgive him, have mercy on him, keep him safe and sound, and pardon him; wash him with water and snow and hail, and cleanse him of sins just as a white garment is cleansed of dirt. Give him in exchange for his house that is better than his house, and a family that is better than his family. Protect him from the trial of the grave and the torment of the Fire).'" Sahih