Salim narrates from his father, Sayyiduna Abdullah bin Umar (may Allah be pleased with him), that the Prophet Muhammad (peace and blessings be upon him) said: "Envy is permitted only towards two types of people. One is the person whom Allah has granted knowledge of the Qur'an, and he remains engaged with it day and night; and the other is the person whom Allah has granted wealth, and he spends it day and night."