It is reported that Yaḥyā b. Abī Kathīr – Allāh have mercy on him – said:

It used to be said, “People have never honoured themselves with anything [better] than the obedience of Allāh, and they have never dishonoured themselves with anything [worse] than disobedience to Allāh.”

Ibn Abī Al-Dunyā, Muḥāsabatu Al-Nafs article 98.