Urwah bin al-Zubayr and Sa'id bin al-Musayyib narrated that they heard Hakim bin Hizam (may Allah be pleased with him) say: I asked the Messenger of Allah (peace and blessings be upon him) and he gave me; then I asked him and he gave me; then he said: "This wealth is green and sweet. Whoever takes it with a contented heart, it is blessed for him; and whoever takes it with greed, it is not blessed for him, and he is like one who eats but is never satisfied. And the upper hand is better than the lower hand."
Hadith Referenceالمعجم الكبير للطبراني / باب الحاء / 3066