Muhammad ibn Isa ibn Ubayd narrated from Hammad ibn Isa, from Hariz, from Muhammad ibn Muslim, who said:
Abu Abdullah عليه السلام said: "Whoever washes a deceased person and shrouds him must perform the ritual bath (ghusl) of janabah."
Ali Akbar al-Ghaffari
Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 1, p. 474