It is narrated from Ata bin Yasar (may Allah have mercy on him) that the Messenger of Allah (peace and blessings be upon him) said: "Beware of qusamah." They asked: What is qusamah? He (peace and blessings be upon him) said: "A man is (in charge) over a group of people, and then he takes a share from this one and also takes from that one."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب قسم الفيء والغنيمة / 13025