Musnad Ahmad 32:94

Ibn Abi ‘Adi and Sahl ibn Yusuf—the meaning being the same—narrated to us, from Humayd, from Anas, who said: The prayer was established, and a man came running. He reached [the row] while his breath was labored or he was panting. When he reached the row, he said: "Praise be to Allah, a praise that is abundant, good, and blessed therein." When the Messenger of Allah (peace and blessings of Allah be upon him) finished his prayer, he said: "Which of you was the speaker?" The people remained silent. He said: "Which of you was the speaker? For he said something good and did not say anything wrong." A man said: "O Messenger of Allah, I was walking quickly, and I reached the row, so I said what I said." He said: "I saw twelve angels competing to see which of them would ascend with it." Then he said: "When one of you comes to the prayer, let him walk with his composure. Let him pray what he catches, and let him complete what he missed."