Hadithcore
Mishkat al-Masabih, 2356

‘Abdallah b. Busr reported God's messenger as saying, “Blessed is he who finds a great amount of asking for pardon in his record.” Ibn Majah transmitted it, and Nasa'i transmitted in <i>'Amal yaum walaila.</i> 1 1. <i>Mirqat</i>, iii, 78 gives this as the title of a book by Nasa’i. The only reference to this tradition in the Concordance is Ibn Majah, <i>Adab</i>, 57.

وَعَن عبد الله بن يسر قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «طُوبَى لِمَنْ وَجَدَ فِي صَحِيفَتِهِ اسْتِغْفَارًا كَثِيرًا» . رَوَاهُ ابْنُ مَاجَهْ وَرَوَى النَّسَائِيُّ فِي «عملِ يَوْم وَلَيْلَة»

References1 variant
In-Book Reference
Book 9, Hadith 129