وَعَنْ أَنَسٍ عَنِ
النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: «مَنْ قَرَأَ كُلَّ يَوْمٍ مِائَتَيْ مَرَّةٍ (قُلْ هُوَ اللَّهُ أَحَدٌ) مُحِيَ عَنْهُ ذُنُوبُ خَمْسِينَ سَنَةً إِلَّا أَنْ يَكُونَ عَلَيْهِ دَيْنٌ»
The Prophet (sallallahu alayhi wa sallam) said:, ‘If anyone recites two hundred times daily, ‘Say, He is God, One’, the sins of fifty years will be wiped out, unless he is in debt.’ Tirmidhi and Darimi transmitted it. The latter’s version has “fifty times”, and he did not mention “unless he is in debt.”
Mishkat al-Masabih 2062, Book 9, The Excellent Qualities of the Qur'an, Hadith 48. 1 min read