Narrated Buraidah: The Prophet ﷺ as saying: When we appoint someone to an administrative post and provide him with an allowance, anything he takes beyond that is unfaithful dealing.
Hadith ReferenceSunan Abi Dawud / Tribute, Spoils, and Rulership (Kitab Al-Kharaj, Wal-Fai Wal-Imarah) / Hadith: 2943
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:إسناده حسن, مشكوة المصابيح (3748), صححه ابن خزيمة (2369 وسنده حسن)