Musnad Ahmad 30:132

Sufyan narrated to us, from al-Zuhri, from Sa’id, from Abu Hurayrah, it was said to him: "From the Prophet, may Allah bless him and grant him peace?" He said: "Yes: 'When you come to the prayer, do not come to it while you are running. Come to it and upon you is tranquility. So whatever you catch, pray, and whatever you miss, complete.'"