Al-Hasan bin Mahbub, from Ibrahim bin Mihzam, from Talhah bin Zaid, from Abu Abdullah عليه السلام:
The father (Imam Al Baqir عليه السلام) of Him (Imam Al Sadiq عليه السلام) used to prefer that a cover be placed between the deceased and the sky, meaning when the deceased is being washed.
Ali Akbar al-Ghaffari
Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 1, p. 457