It is narrated from Sayyiduna Ali (may Allah be pleased with him) that three men came to the service of the Prophet (peace and blessings be upon him). One of them said: O Messenger of Allah! I had one hundred dinars, out of which I gave ten dinars in charity. The second said: O Messenger of Allah! I had ten dinars, and I gave one dinar in charity. The third said: I had one dinar, and I gave a tenth of it in charity. The Prophet (peace and blessings be upon him) said: "All of you will receive equal reward, because all of you have given a tenth of your wealth in charity."
Hadith Referenceمسند احمد / مسند الخلفاء الراشدين / 743
Hadith Gradingحکم دارالسلام:إسناده ضعيف لضعف الحارث الأعور، وعنعنة أبى إسحاق