Sahih Muslim , Book 35, Hadith 6500 (USC-MSA) ⓘ
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 " .
also referenced under: Book 48, Hadith 30 (In-Book) & Hadith 2687 (Reference)