And Qutaybah ibn Sa'id narrated to us, saying: Al-Mughirah—and he is Ibn 'Abd al-Rahman al-Hizami—narrated to us, from Abu al-Zinad, from al-A'raj, from Abu Hurayrah, that the Prophet, peace and blessings be upon him, said: "When one of you leads the people in prayer, let him shorten it, for among them are the young, the old, the weak, and the sick. But when he prays alone, let him pray however he wishes."