It is narrated from Sayyiduna Hakim bin Hizam (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said to him: "This wealth is green and sweet. Whoever asks people, they give to him, but the one who asks for it is like one who eats and is never satisfied."
Hadith Referenceالمعجم الكبير للطبراني / باب الحاء / 3101