وَعَنْ أَبِي هُرَيْرَةَ رَضِيَ اللَّهُ عَنْهُ
قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «مَنْ قَرَأَ (حم) الدُّخَانِ فِي لَيْلَةِ الْجُمْعَةِ غُفِرَ لَهُ»
He reported God’s messenger as saying, “If anyone recites Ha Mim ad-Dukhan on a Thursday night his sins will be forgiven.” Tirmidhi transmitted it, saying that this is a gharib daif tradition and that Hisham Abul Miqdam its transmitter is declared to be weak.
Mishkat al-Masabih 2055, Book 9, The Excellent Qualities of the Qur'an, Hadith 41. 1 min read