God’s Messenger sent me to the Yemen, but when I set off he sent after me and I was brought back. He then said, “Do you know why I sent for you? Do not take anything without my permission, for it is unfaithful dealing, and he who acts unfaithfully will come on the day of resurrection with the unfaithful deeds he has done. This is why I called you. Now go off to your task."
Al-Mustadrid b. Shaddad told that he heard the Prophet say, “He who acts as a governor for us must get a wife; if he has not a servant he must get one, and if he has not a dwelling he must get one.” A version says, “He who takes anything else than that is acting unfaithfully.”
Buraida reported the Prophet as saying, “When we appoint someone to an administrative post and provide him with an allowance, anything he takes beyond that is unfaithful dealing."