Az-Zumar 39:55

WattabiAAoo ahsana maonzila ilaykum min rabbikum min qabli an ya/tiyakumu alAAathabubaghtatan waantum la tashAAuroon

And follow the best of what was revealed to you from your Lord [i.e., the Qur’ān] before the punishment comes upon you suddenly while you do not perceive,

And follow the best of what has been sent down to you from your Lord before the punishment comes to you suddenly when you do not even expect,