It is reported that Saʿīd b. Jubayr – Allāh have mercy on him – said:
Verily, fear (al-khashyah) is that you fear Allāh such that your fear comes between you and your disobedience (of Allāh). That is khashyah. And dhikr (remembrance) is obedience to Allāh: whoever obeys Allāh has remembered Him; and whoever does not obey Him is not a rememberer of Him, even if he says a lot of tasbīḥ and recites a lot of Qurān.
Al-Dhahabī, Siyar ʾAʿlām Al-Nubalāʾ 4:326.