Muhammad bin Ka'b al-Qurazi (may Allah have mercy on him) said: I heard Mu'awiyah (may Allah be pleased with him) giving a sermon, and he said: "When Allah intends good for someone, He grants him understanding of the religion; and this wealth is sweet and green, so whoever takes it by its right is blessed in it." Then he would say: "I heard these words from the Messenger of Allah (peace and blessings be upon him) on the pulpit; and indeed the one who hears and obeys has no argument against him, and the one who hears and disobeys has no argument in his favour."
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 16834