Sayyiduna Abu Mas'ud (may Allah be pleased with him) says: A man came to the Prophet (peace and blessings be upon him) and said: "O Messenger of Allah! I stay behind from the morning prayer because so-and-so makes the prayer long for us." He (peace and blessings be upon him) said: "Among you there are those who drive people away. Whoever leads people in prayer should make it light, for the sick, the old and the needy are present."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 5264