Musannaf Ibn Abi Shayba 22:370

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