Musnad Ahmad 371

Hajjaj narrated to us; Layth narrated to us; Bukayr ibn ‘Abd Allah related to me, from Busr ibn Sa‘id, from Ibn al-Sa‘di al-Maliki, who said: ‘Umar ibn al-Khattab, may Allah be pleased with him, appointed me to collect charity. When I had finished and delivered it to him, he ordered that I be given a payment for my work. I said, “I only worked for Allah, and my reward is with Allah.” He said, “Take what you have been given. I worked during the time of the Messenger of Allah, peace and blessings be upon him, and he paid me. I said to him what you have just said, and the Messenger of Allah told me, ‘When you are given something without asking for it, eat from it and give some in charity.’”’