Musnad Abu Ya'la al-Mawsili 153:64

Amr ibn Muhammad narrated to us, Sufyan narrated to us, from al-Zuhri, from Salim, from his father, from the Prophet (peace be upon him), who said: "There is no envy except in two: A man whom Allah has given wealth, so he spends from it during the hours of the night and the hours of the day; and a man whom Allah has given the Quran, so he stands with it during the hours of the night and the day."