Qais b. Abu Hazim said Abu Mas'ud told him of a man saying, “I swear by God, Messenger of God, that I keep away from the Morning Prayer on account of so and so, because he keeps us so long.” I never saw God’s Messenger more angry when giving an exhortation than he was that day. He said, “Some of you are scaring people away, so whoever of you leads the people in prayer must be brief, for among them are the weak, the aged, and people who have business to do.” (Bukhari and Muslim.)