Sahih Muslim
The Book of Prayers (Kitab Al-Salat)
Book Number: 004 / Hadith Number: 1778
Salim son of Abdullah b. 'Umar is reported to have said on the authority of his father that the Messenger of Allah (may peace be upon him) observed: Envy is not justified but in case of two persons only: one who, having been given (knowledge of) the Qur'an by Allah, recites it during the night and during the day (and acts upon it), and the person who, having been given wealth by God, gives it in charity during the night and the day.