Riyad as-Salihin (The Meadows of the Righteous)
by Imam Nawawi
93. Chapter: On the Recommendation of going to the prayer and to knowledge and other forms of worship with calmness and dignity
Allah Almighty says, "As for those who honour Allah's sacred rites, that comes from taqwa in their hearts." (22:32)
704. Abu Hurayra reported: "I heard the Messenger of Allah, may Allah bless him and grant him peace, say, 'When the prayer is done, do not come to it running. Come to it walking. You must be tranquil. Pray what you catch and complete what you miss.'" [Agreed upon]
Muslim added in a variant of his, "When one of you makes for the prayer, he is in the prayer."
705. Ibn 'Abbas said that he was close to the Prophet, may Allah bless him and grant him peace, on the Day of 'Arafat and the Prophet heard behind him a harsh rebuke and a blow and the cry of a camel. He pointed at them with his whip and said, 'O people! You must be calm. Piety is not a matter of speed.'" [Muslim]