Mukhtasar Bukhari (Abridged) 417 — The imam should shorten standing

Sayyiduna Abu Mas’ud (may Allah be pleased with him) says that a man said, “O Messenger of Allah! By Allah, I stay away from the morning prayer only because of so-and-so, as he makes the prayer too long for us.” Then I have never seen the Messenger of Allah (peace and blessings be upon him) more angry in giving advice than he was that day. After that, the Prophet (peace and blessings be upon him) said: “Some of you make people dislike (worship). So whoever among you leads the people in prayer should make it short, for among the congregation are the weak, the elderly, and those with needs.”