Musnad Ahmad 28:582

'Affan narrated to us, Hammad bin Salamah narrated to us, 'Ata' bin as-Sa'ib informed us, from his father, from 'Abdullah bin 'Amr, that a man entered the prayer and said: "Praise be to Allah, and He is glorified (Al-hamdu lillahi wa subhana Allah)." The Messenger of Allah (peace and blessings of Allah be upon him) said: "Who is the one who said it?" The man said: "I am." He said: "I have seen the angels receiving it from one another."