Tafsir of Az-Zumar 39:54

وأنيبوا إلى ربكم وأسلموا له

And turn in repentance (and in obedience with true faith) to your Lord and submit to Him, meaning, turn back to Allah and submit yourselves to Him.

من قبل أن يٲتيكم العذاب ثم ﻻ تنصرون

before the torment comes upon you, (and) then you will not be helped. means, hasten to repent and do righteous deeds before His wrath comes upon you