It is narrated from Sayyiduna Ka'b bin Malik (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Two hungry wolves let loose among a flock of sheep do not cause as much harm to it as a man's greed for wealth and honour causes to his religion."
Hadith Referenceالمعجم الكبير للطبراني / باب الكاف / 16239