Jami' at-Tirmidhi
Jami` at-Tirmidhi 3463
حَدَّثَنَا مُحَمَّدُ بْنُ بَشَّارٍ، حَدَّثَنَا يَحْيَى بْنُ سَعِيدٍ، حَدَّثَنَا مُوسَى الْجُهَنِيُّ، حَدَّثَنِي مُصْعَبُ بْنُ سَعْدٍ، عَنْ أَبِيهِ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ لِجُلَسَائِهِ " أَيَعْجِزُ أَحَدُكُمْ أَنْ يَكْسِبَ أَلْفَ حَسَنَةٍ " . فَسَأَلَهُ سَائِلٌ مِنْ جُلَسَائِهِ كَيْفَ يَكْسِبُ أَحَدُنَا أَلْفَ حَسَنَةٍ قَالَ " يُسَبِّحُ أَحَدُكُمْ مِائَةَ تَسْبِيحَةٍ تُكْتَبُ لَهُ أَلْفُ حَسَنَةٍ وَتُحَطُّ عَنْهُ أَلْفُ سَيِّئَةٍ " . قَالَ هَذَا حَدِيثٌ حَسَنٌ صَحِيحٌ .
Unreviewed translation. All hadiths in this collection are available in five languages. Titles and introductions may remain in Arabic.
Muhammad ibn Bashshar narrated to us; Yahya ibn Sa‘id narrated to us; Musa al-Juhani narrated to us; Mus‘ab ibn Sa‘d narrated to me, from his father, that the Messenger of Allah (peace and blessings be upon him) said to those sitting with him: ‘Is one of you unable to earn one thousand good deeds?’ Someone among those present asked: ‘How can one of us earn one thousand good deeds?’ He said: ‘One of you should glorify Allah one hundred times; one thousand good deeds will be written for him and one thousand bad deeds will be erased from him.’ He said: ‘This is a hasan sahih hadith.’
Notes and open questions — unreviewed
The source gives the act as saying tasbih one hundred times, without specifying a fuller formula in this passage.