Muhammad ibn Ya‘qub from Ali ibn Ibrahim from his father from Abdullah ibn al-Mughirah from Jamil: Abu Abdillah عليه السلام said: “If you are behind an imam and he recites al-Hamd (Surah al-Fatiha) and finishes its recitation, then you say: ‘Al-hamdu lillahi Rabbil-‘alamin’ (All praise is due to Allah سبحانه وتعالى, Lord of the worlds), and do not say ‘Amin’.”