Al-Hafiz Abu Ya`la recorded that Abu Hurayrah, may Allah be pleased with him, said, "The Messenger of Allah said,
«مَنْ قَرَأَ يس فِي لَيْلَةٍ أَصْبَحَ مَغْفُورًا لَهُ، وَمَنْ قَرَأَ حم الَّتِي يُذْكَرُ فِيهَا الدُّخَانُ أَصْبَحَ مَغْفُورًا لَه»
Whoever recites Ya Sin in the night, will wake up forgiven, and whoever recites Ha Mim in which Ad-Dukhan (the Smoke) is mentioned, will wake up forgiven.
Its chain of narration is good (jayyid).
Ibn Hibban recorded in his Sahih that Jundub bin `Abdullah, may Allah be pleased with him, said, The Messenger of Allah said,
«مَنْ قَرَأَ يس فِي لَيْلَةٍ ابْتِغَاءَ وَجْهِ اللهِ عَزَّ وَجَلَّ غُفِرَ
Whoever recites Ya Sin in the night, seeking the Face of Allah, will be forgiven.
