It is narrated from Sayyiduna Abu Umamah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Whoever washes a deceased person and keeps his faults covered, Allah will purify him of his sins; and if he also shrouds him, Allah will clothe him with the silk of Paradise."
Hadith Referenceالمعجم الكبير للطبراني / باب الصاد / 8047