Sahih
Muslim
صحيح مسلم
48
The Book Pertaining to the Remembrance of Allah, Supplication, Repentance and Seeking Forgiveness
كتاب الذكر والدعاء والتوبة والاستغفار
Chapter 6: The Virtue Of Remembrance, Supplication, Drawing Close To Allah And Thinking Positively Of Him
باب فَضْلِ الذِّكْرِ وَالدُّعَاءِ وَالتَّقَرُّبِ إِلَى اللَّهِ تَعَالَى
Sahih Muslim 2687 b
A hadith like this has been transmitted on the authority of A'mash with the same chain of transmitters and he (further) said
There is for him ten like that (the good he performed) or more than that.حَدَّثَنَا أَبُو كُرَيْبٍ، حَدَّثَنَا أَبُو مُعَاوِيَةَ، عَنِ الأَعْمَشِ، بِهَذَا الإِسْنَادِ . نَحْوَهُ غَيْرَ أَنَّهُ قَالَ " فَلَهُ عَشْرُ أَمْثَالِهَا أَوْ أَزِيدُ " .
Grade: Sahih