What was narrated by Muhammad ibn Ali ibn Mahbub from Ahmad ibn Muhammad from Musa ibn al-Qasim from Ali ibn Ja‘far from his brother (Imam) Musa ibn Ja‘far عليه السلام, peace be upon them, said: I asked Him عليه السلام about a man who recites the same Surah in both rak‘ahs of the obligatory prayer while he is able to recite others, if he does so, is there anything upon him? Imam عليه السلام said: “If he can recite other than it, then he should not do it. But if he cannot recite other than it, then there is no harm.”