Musannaf Ibn Abi Shayba 22:75

Sharik narrated to us, from Furat, from Sa’id ibn Jubayr, who said: "The *Qani’* (the content one) is the one who asks." Then he recited verses by al-Shammakh: "The wealth of a man improves him, then it perishes; Those who strive for it are more chaste than the one who is content."