Abd al-Rahman bin Abi Layla said: I heard Ali (may Allah be pleased with him) saying: The Messenger of Allah (peace and blessings be upon him) gave me charge of the fifth of the one-fifth, and I placed it in its proper places in the lifetime of Abu Bakr and Umar (may Allah be pleased with them both) and in the lifetime of the Messenger of Allah (peace and blessings be upon him) as well. In one narration: Some wealth was brought; he called me and said: "Take it." I said: I do not want it. He said again: "Take it; you are more entitled to it." I said: We have no need of it; so he put it into the public treasury (bayt al-mal).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب قسم الفيء والغنيمة / 12961