عَنْ سَعْدٍ رَضِيَ اللَّهُ عَنْهُ عَنْ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ أَنَّهُ قَالَ أَيَعْجِزُ أَحَدُكُمْ أَنْ يَكْسِبَ فِي الْيَوْمِ أَلْفَ حَسَنَةٍ قَالَ وَمَنْ يُطِيقُ ذَلِكَ قَالَ يُسَبِّحُ مِائَةَ تَسْبِيحَةٍ فَيُكْتَبُ لَهُ أَلْفُ حَسَنَةٍ وَتُمْحَى عَنْهُ أَلْفُ سَيِّئَةٍ
It is narrated from Sayyiduna Sa’d (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: Are you incapable of performing one thousand good deeds every day? They said: Who has the strength to do so many good deeds? He (peace and blessings be upon him) said: Say “Subhan Allah” one hundred (100) times; one thousand good deeds will be written for him and one thousand sins will be erased from him.