Sunan at-Tirmithiy كتاب الدعوات باب [ غرس الجنة سبحان الله والحمد لله ]

حَدَّثَنَا مُحَمَّدُ بْنُ بَشَّارٍ حَدَّثَنَا يَحْيَى بْنُ سَعِيدٍ حَدَّثَنَا مُوسَى الْجُهَنِىُّ حَدَّثَنِى 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.
The Messenger of God, peace and blessings of God be upon him, asked his companions, who were sitting with him, "Is anyone of you unable to earn one thousand good deeds (1)? So one of them asked him, "How can anyone of us earn one thousand good deeds?" He replied, "Anyone of you who exalts [God] one hundred times is awarded one thousand good deeds; and one thousand evil deeds (committed) are off-loaded from him."
1- Because each good deed is multiplied by ten.