Musnad Abu Ya'la al-Mawsili 160:102

And with his chain of narration, that the Messenger of Allah (may Allah bless him and grant him peace) said: "When the call to prayer is made, do not come to it while you are running. Come to it while you are upon tranquility. Whatever you catch, pray it, and whatever you miss, complete it. For indeed, when one of you intends to pray, he is in a state of prayer."