Tribute, Spoils, and Rulership (Kitab Al-Kharaj, Wal-Fai' Wal-Imarah)
Dawud :: Book 19 : Hadith 2939
Narrated Al-Mustawrid ibn Shaddad:
Al-Mustawrid heard the Prophet (peace_be_upon_him) say: He who acts as an employee 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. He said that AbuBakr reported: I was told that the Prophet (peace_be_upon_him) said: He who takes anything else he is unfaithful or thief.