It is narrated from Sayyiduna Mustawrid bin Shaddad (may Allah be pleased with him) that I heard the Messenger of Allah (peace and blessings be upon him) say: "Whoever is an official (amil) for us, let him take a wife (at the expense of the public treasury). If he has no servant, let him take a servant too, and if he has no house, let him take a house too." Abu Bakr (may Allah be pleased with him) said: I have been informed that the Messenger of Allah (peace and blessings be upon him) said: "Whoever takes anything besides that is a defrauder or a thief."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب قسم الفيء والغنيمة / 13018