It is narrated from Hazrat Malik bin Atahiya (may Allah be pleased with him) that I heard the Prophet (peace and blessings of Allah be upon him) say: If you see someone unjustly collecting tax, then kill him. The previous hadith is also narrated from Qutaiba bin Saeed.
Qutaibah ibn Sa'id narrated to us this hadith, and he shortened some of the chain of narration, and said: He means by that the charity which he takes without right.
Hadith Referenceمسند احمد / مسند الشاميين / 18058
Hadith Gradingحکم دارالسلام:إسناده ضعيف، راجع ما قبله