"There is a surah in the Qur'an, with thirty verses, which will intercede for its companion (the one who recites it) until he is forgiven: Tabarakal-ladhi bi yadihil mulk (Blessed is He in Whose Hand is the Dominion)." (Using translation from Ibn Mājah 3786)   

عَنْ رَسُولِ اللهِ ﷺ قَالَ إِنَّ سُورَةً فِي الْقُرْآنِ ثَلَاثُونَ آيَةً شَفَعَتْ لِصَاحِبِهَا حَتَّى غُفِرَ لَهُ {تَبَارَكَ الَّذِي بِيَدِهِ الْمُلْكُ} [الملك 1]؟ فَأَقَرَّ بِهِ أَبُو أُسَامَةَ وَقَالَ نَعَمْ