Musnad Abu Ya'la al-Mawsili 156:9

Yahya ibn Ayyub narrated to us, Mus'ab ibn al-Miqdam narrated to us, Abu al-Muqaddam narrated to us, from al-Hasan, from Abu Hurayrah, from the Prophet (peace and blessings of Allah be upon him), who said: "Whoever recites Surah al-Dukhan on the night of Jumu'ah, he will wake up forgiven."