Full Sharh — Mishkat al-Masabih 2061
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» . رَوَاهُ التِّرْمِذِيُّ وَالدَّارِمِيُّ وَفِي رِوَايَتِهِ «خَمْسِينَ مَرَّةٍ» وَلَمْ يَذْكُرْ «إِلَّا أَنْ يَكُونَ عَلَيْهِ دين»
English Translation
Anas reported the Prophet as saying, '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.” Tirmidhī and Dārimī transmitted it. The latter’s version has “fifty times”, and he did not mention “unless he is in debt.”
Source
Mishkat al-Masabih(مشكاة المصابيح)
The Excellent Qualities of the Qur'an
Hadith Number
2061