Musnad Ahmad 30:3285

Hajjaj narrated to us, he said: Ibn Jurayj said: Musa ibn Uqbah informed me, from Suhayl ibn Abi Salih, from his father, from Abu Hurayrah, from the Prophet, peace and blessings of Allah be upon him, who said: "Whoever sits in a gathering in which his clamor is frequent, and says before he stands up: 'Glory be to You, our Lord, and with Your praise; there is no god but You; I seek Your forgiveness and I repent to You,' Allah will forgive him what occurred in that gathering of his."