And from him, from Muhammad ibn Yahya from Ahmad ibn Muhammad from Ibn Abi Najran from Safwan from Abu al-Hasan عليه السلام. He said:
(Imam عليه السلام said) “Pray the two rak’ahs of the fajr (supererogatory prayer) in the howdah (riding seat).”
Ali Akbar al-Ghaffari
Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 2, p. 16