Narrated from him from al-Hasan from Zur’ah from Sama’ah, who said:
I asked Him عليه السلام about the mu’adhdhin, may he speak while giving the adhan? Imam عليه السلام said: "There is no harm after he finishes his adhan."
Ali Akbar al-Ghaffari
Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 2, p. 58