Ibn Buraydah narrates from his father (Sayyiduna Buraydah, may Allah be pleased with him) that when the matter of washing the Messenger of Allah (peace and blessings be upon him) arose, a caller called out to them from inside: "Do not remove the shirt of the Messenger of Allah (peace and blessings be upon him)."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجنائز / 6623