It is narrated from Sayyiduna Ibn Mas'ud (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "Envy (desirous admiration) is not permissible except in two cases: one is the person whom Allah has granted wealth and He enables him to spend it in the right way, and the other is the person whom Allah has granted wisdom and he judges with it among the people and teaches it to others."