The Prophet ﷺ said, "There is a surah in the Quran of thirty verses that interceded for its companion until he was forgiven. It is 'Blessed is He in whose hand is the dominion' [Mulk 67:1]."
حدثنا أبو بكر بن أبي شيبة حدثنا أبو أسامة عن شعبة عن قتادة عن عباس الجشمي
عن النبي ﷺ قال إن سورة في القرآن ثلاثون آية شفعت لصاحبها حتى غفر له تبارك الذي بيده الملك
[Its isnad is hasan] Reference: Abu Dawud narrated it in the Book of Prayer, chapter on the number of verses, no. 1400, from the hadith of Shubah, with this same wording. Tirmidhi (no. 2891) said it is hasan. Ibn Hibban graded it sahih (no. 1766), as did Hakim (2/497–498), and Dhahabi agreed with him.