From him, from Ibn Abi Nasr, from al-Ala’, from Muhammad ibn Muslim, who said:
Abu Ja’far عليه السلام, peace be upon him, said to me: “Pray the night prayer (salat al-layl), the witr, and the two rak‘ahs in the litter (al-mahmil).”
Ali Akbar al-Ghaffari
Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 3, p. 250