Narrated from him from Ahmad ibn Muhammad:
The Righteous servant (Abd Salih عليه السلام), peace be upon him, said: "A man may give the adhan while sitting, but he should not give the iqamah except while standing." And Imam عليه السلام said: "You may give the adhan while riding, but do not give the iqamah except while on the ground."
Ali Akbar al-Ghaffari
Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 2, p. 61