Sayyiduna Abu Hurayrah (may Allah be pleased with him) said: I heard the Messenger of Allah (peace and blessings be upon him) say: "When the iqamah is called, do not come running, but come walking with calm and tranquillity; whatever you catch, pray it, and whatever you have missed, complete it afterwards."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 3623