Salim narrates from his father that the Prophet Muhammad (peace 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 (i.e., he recites it and teaches it); the other is the person whom Allah has granted wealth, and he spends from it (in the way of Allah) day and night."