Riyad as-Salihin

K'ab bin Malik (May Allah be pleased with him) reported: Messenger of Allah (ﷺ) said, "Two hungry wolves sent in the midst of a flock of sheep are no more destructive to them than a man's greed for wealth and fame is to his Deen."

[At- Tirmidhi, who classified it as Hadith Hasan Sahih].