Musnad Ahmad 925
It was narrated that ‘Ali (رضي الله عنه) said:
Three people came to the Messenger of Allah (ﷺ) and one of them said: I had one hundred Ooqiyyahs and I spent one Ooqiyyah (in charity). The next one said: I had one hundred dinars and i spent ten dinars (in charity). The next one said: I had ten dinars and I spent one dinar (in charity). The Prophet (ﷺ) said: “You are equal in reward, for each of you gave one tenth of his wealth in charity.”
حَدَّثَنَا عَبْدُ الرَّزَّاقِ، أَخْبَرَنَا مَعْمَرٌ، عَنْ أَبِي إِسْحَاقَ، عَنِ الْحَارِثِ، عَنْ عَلِيٍّ، رَضِيَ اللَّهُ عَنْهُ قَالَ جَاءَ ثَلَاثَةُ نَفَرٍ إِلَى رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَقَالَ أَحَدُهُمْ كَانَتْ لِي مِائَةُ أُوقِيَّةٍ فَأَنْفَقْتُ مِنْهَا عَشْرَةَ أَوَاقٍ وَقَالَ الْآخَرُ كَانَتْ لِي مِائَةُ دِينَارٍ فَتَصَدَّقْتُ مِنْهَا بِعَشَرَةِ دَنَانِيرَ وَقَالَ الْآخَرُ كَانَتْ لِي عَشَرَةُ دَنَانِيرَ فَتَصَدَّقْتُ مِنْهَا بِدِينَارٍ فَقَالَ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ أَنْتُمْ فِي الْأَجْرِ سَوَاءٌ كُلُّ إِنْسَانٍ مِنْكُمْ تَصَدَّقَ بِعُشْرِ مَالِهِ‏.‏