Ahmad ibn Muhammad from Ali ibn Mahziyar who said:
I asked Abu Ja'far, peace be upon him, about a man who speaks during the obligatory prayer with anything by which he converses with his Lord عز وجل. Imam عليه السلام said: "Yes."
Ali Akbar al-Ghaffari
Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 2, p. 351