Sunan Ibn Majah, Volume 5, Book 33, Hadith 3819 (DarusSalam) ⓘ
It was narrated from 'Abdullah bin 'Abbas that : the Messenger of Allah said: "Whoever persists in asking for forgiveness, Allah will grant him relief from every worry, and a way out from every hardship, and will grant him provision from (sources) he could never imagine."
حَدَّثَنَا هِشَامُ بْنُ عَمَّارٍ، حَدَّثَنَا الْوَلِيدُ بْنُ مُسْلِمٍ، حَدَّثَنَا الْحَكَمُ بْنُ مُصْعَبٍ، عَنْ مُحَمَّدِ بْنِ عَلِيِّ بْنِ عَبْدِ اللَّهِ بْنِ عَبَّاسٍ، أَنَّهُ حَدَّثَهُ عَنْ عَبْدِ اللَّهِ بْنِ عَبَّاسٍ، قَالَ قَالَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ " مَنْ لَزِمَ الاِسْتِغْفَارَ جَعَلَ اللَّهُ لَهُ مِنْ كُلِّ هَمٍّ فَرَجًا وَمِنْ كُلِّ ضِيقٍ مَخْرَجًا وَرَزَقَهُ مِنْ حَيْثُ لاَ يَحْتَسِبُ " .
also referenced under: Hadith 3819 (Reference) & Book 33, Hadith 164 (In-Book)