Sahih Bukhari 702

Narrated Abu Huraira: Allah's Apostle said, If anyone of you leads the people in the prayer, he should shorten it for amongst them are the weak, the sick and the old; and if anyone among your prays alone then he may prolong (the prayer) as much..

Narrated Abu Mas`ud: A man came and said, O Allah's Apostle! I keep away from the morning prayer because so-and-so (Imam) prolongs it too much. Allah's Apostle became furious and I had never seen him more furious than he was on that day. The..

Narrated Jabir bin `Abdullah Al-Ansari: Once a man was driving two Nadihas (camels used for agricultural purposes) and night had fallen. He found Mu`adh praying so he made his camel kneel and joined Mu`adh in the prayer. The latter recited Surat..

Narrated Anas: The Prophet used to pray a short prayer (in congregation) but used to offer it in a perfect manner. ..

Narrated `Abdullah bin 'Abi Qatada: My father said, The Prophet said, 'When I stand for prayer, I intend to prolong it but on hearing the cries of a child, I cut it short, as I dislike to trouble the child's mother.' ..

Narrated Anas bin Malik: I never prayed behind any Imam a prayer lighter and more perfect than that behind the Prophet and he used to cut short the prayer whenever he heard the cries of a child lest he should put the child's mother to trial. ..