Narrated from him from Fadalah from Ibn Sinan, who said:
I asked Him عليه السلام about calling (the adhan) before the rising of Fajr. Imam عليه السلام said: "There is no harm, but the sunnah is to call at the time of Fajr. And indeed, that (calling before Fajr) benefits the neighbors", meaning, before the Fajr.
Ali Akbar al-Ghaffari
Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 2, p. 57