Narrated Muhammad ibn Abdullah ibn Numayr: My father narrated to us: Amr ibn Uthman narrated to us: Musa ibn Talhah narrated to me: Uthman ibn Abi al-As al-Thaqafi narrated to me that the Prophet, peace and blessings be upon him, said to him: "Lead your people in prayer." He said: I said, "O Messenger of Allah, I find something in myself." He said: "Come closer." So he seated me before him, then placed his palm on my chest between my breasts, then said: "Turn around." So he placed it on my back between my shoulders, then said: "Lead your people in prayer. Whoever leads a people in prayer, let him shorten it, for among them are the elderly, among them are the sick, among them are the weak, and among them are those with needs. And when one of you prays alone, let him pray however he wishes."