Mishkat al-Masabih 1854

Ibn al-Saidi al-Maliki said: Umar ibn al-Khattab, may Allah be pleased with them both, appointed me to collect alms. When I had finished and delivered them to him, he ordered that I be paid. I said, ‘I worked only for Allah, and my reward is with Allah.’ He said, ‘Take what you are given. I worked in the time of the Messenger of Allah ﷺ, and he paid me. I said what you have just said, and the Messenger of Allah ﷺ told me: “When you are given something without asking for it, take it and give it in charity.”’ Muslim and Abu Dawud transmitted it.