Musnad Ahmad 28:156

'Abd al-Samad narrated to us, Hammad narrated to us, from 'Ata', from his father, from 'Abdullah ibn 'Amr, that a man said one day, while entering the prayer: "Praise be to Allah, filling the heavens," and he glorified [Allah] and supplicated. The Messenger of Allah (peace and blessings of Allah be upon him) said: "Who is the one who said them?" The man said: "I am." The Prophet (peace and blessings of Allah be upon him) said: "I have seen the angels receiving them from one another."