Musnad Ahmad ibn Hanbal, hadith 704

حَدَّثَنَا وَكِيعٌ، حَدَّثَنَا سُفْيَانُ، عَنْ أَبِي إِسْحَاقَ، عَنِ الْحَارِثِ، عَنْ عَلِيٍّ، رَضِيَ اللَّهُ عَنْهُ قَالَ جَاءَ ثَلَاثَةُ نَفَرٍ إِلَى النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَقَالَ أَحَدُهُمْ يَا رَسُولَ اللَّهِ كَانَتْ لِي مِائَةُ دِينَارٍ فَتَصَدَّقْتُ مِنْهَا بِعَشَرَةِ دَنَانِيرَ وَقَالَ الْآخَرُ يَا رَسُولَ اللَّهِ كَانَ لِي عَشَرَةُ دَنَانِيرَ فَتَصَدَّقْتُ مِنْهَا بِدِينَارٍ وَقَالَ الْآخَرُ كَانَ لِي دِينَارٌ فَتَصَدَّقْتُ بِعُشْرِهِ قَالَ فَقَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ كُلُّكُمْ فِي الْأَجْرِ سَوَاءٌ كُلُّكُمْ تَصَدَّقَ بِعُشْرِ مَالِهِ‏.‏

Three people came to the Prophet (ﷺ) and one of them said: O Messenger of Allah (ﷺ), I had one hundred dinars and i gave ten of them in charity. The next one said: O Messenger of Allah (ﷺ), I had ten dinars and I gave one of them in charity. The next one said: I had one dinar and I gave one-tenth of it in charity. The Messenger of Allah (ﷺ) said: “You are all the same in reward, for each of you gave one tenth of his wealth.”