Sayyiduna Abu Mas'ud (may Allah be pleased with him) said: A man came to the Prophet (peace and blessings be upon him) and said: I hold back from the prayer because of so-and-so, who leads us in long prayers. I never saw the Messenger of Allah (peace and blessings be upon him) angrier in any admonition than he was that day. He (peace and blessings be upon him) said: "O people, among you are some who drive people away. Whoever of you leads the people in prayer should keep it light, for among them are the old, the weak and the one with a need."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 14633