Musnad Ahmad 30:1157

Hajjaj ibn Muhammad and Ibn Ja'far narrated to us, Shu'bah narrated to me, from Qatadah, from 'Abbas al-Jushami, from Abu Hurayrah, from the Prophet, may Allah bless him and grant him peace, that he said: "Indeed, a surah from the Qur'an, [consisting of] thirty verses, interceded for a man until he was forgiven, and it is: 'Blessed is He in whose hand is the dominion' (Tabarak alladhi biyadihi al-mulk)."