Narrated Abu Hurairah:
that the Messenger of Allah (ﷺ) said: "Whoever recites Ha Mim Ad-Dukhan during the night, in the morning seventy thousand angels seek forgiveness for him." (FR)
English reference (FR): Vol. 5, Book 42, Hadith 2888 (FR)
Arabic reference (FR): Book 45, Hadith 3131 (FR)