In describing the evils of greed, he (SAW) gave a beautiful parable:
"Two hungry wolves, if let loose amongst a flock of sheep, cause less harm than a man's eagerness to increase his money and his prestige." Reported by al-Tirmidhi (# 2373), Ahmad and others
In another hadith, he (SAW|) stated,
"Three things destroy, and three things save. As for the three things that destroy, they are: greediness that is obeyed, and desires that are followed, and a person becoming self-conceited (and proud) with himself. As for the three things that save, they are: the fear of Allah in secret and public, and moderation in poverty and richness, and fairness in anger and pleasure."  Reported by al-Bazzar (# 80), Abu Nu'aym in his Hilya (2/343), al-Hayhaqi in his Shu ab al-Iman (2/382) and others, with various chains. Al-Mundhiri wrote (1/162), "All of these chains, even though none of them is safe from criticism, put together raise the hadith to the level of hasan, Allah-willing."