The Prophet ﷺ said, "There is a surah in the Quran of thirty verses that interceded for a man until he was forgiven. It is the surah Tabarak alladhi biyadihi al-mulk."
حدثنا محمد بن بشار حدثنا محمد بن جعفر حدثنا شعبة عن قتادة عن عباس الجشمي
عن النبي ﷺ قال إن سورة من القرآن ثلاثون آية شفعت لرجل حتى غفر له وهي سورة تبارك الذي بيده الملك
[Its isnad is hasan]. Abu Dawud narrated it in the Book of Ramadan, Chapter on the Number of Verses, Hadith: 1400, and Ibn Majah, Hadith: 3786, from the hadith of Shubah through the same route. Ibn Hibban graded it sahih, Hadith: 1766, as did Hakim, 2/497, 498, and Dhahabi agreed with him. It has supporting narrations.