Musannaf Ibn Abi Shayba 33:1192

Mu'awiyah narrated to us, from Sufyan, from Bakhtari al-Ta'i, who said: It used to be said: The most enviable of the living are those who are envied for what the dead are envied for. And know that worship is not sound except with asceticism, and humility during obedience, and finding difficulty in disobedience, and the most beloved of people are those according to the measure of their piety.