Narrated from him from al-Nadr from Ibn Sinan:
Abu Abdillah عليه السلام said: "There is no harm for a traveller to give the adhan while riding, and to give the iqamah while standing on the ground."
Ali Akbar al-Ghaffari
Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 2, p. 60