[Machine] The Messenger of Allah ﷺ said to him, "Fast for one day and you will have the reward of ten days." He said, "Increase me, O Messenger of Allah." He said, "Fast for two days and you will have the reward of nine days." He said, "Increase me." He said, "Fast for three days and you will have the reward of eight days." Thabit said, "So I informed Muattib ibn Abdullah about that, and he said, 'I do not see anything except that it increases in action and decreases in reward.'" Abu Abdullah added, "Some of them increased upon others."  

إِنَّ رَسُولَ اللهِ ﷺ قَالَ لَهُ «صُمْ يَوْمًا وَلَكَ أَجْرُ عَشَرَةِ أَيَّامٍ» قَالَ قُلْتُ زِدْنِي يَا رَسُولَ اللهِ قَالَ «صُمْ يَوْمَيْنِ وَلَكَ تِسْعَةٌ» قَالَ قُلْتُ زِدْنِي قَالَ «صُمْ ثَلَاثَةَ أَيَّامٍ وَلَكَ أَجْرُ ثَمَانِيَةِ أَيَّامٍ» قَالَ ثَابِتٌ فَأَخْبَرْتُ بِذَلِكَ مُطَرِّفَ بْنَ عَبْدِ اللهِ فَقَالَ مَا أُرَاهُ إِلَّا يَزْدَادُ فِي الْعَمَلِ وَيَنْقُصُ مِنَ الْأَجْرِ قَالَ أَبُو عَبْدِ الرَّحْمَنِ زَادَ بَعْضُهُمْ عَلَى بَعْضٍ