Surah Az-Zumar 39:55

وَٱتَّبِعُوٓا۟ أَحْسَنَ مَآ أُنزِلَ إِلَيْكُم مِّن رَّبِّكُم مِّن قَبْلِ أَن يَأْتِيَكُمُ ٱلْعَذَابُ بَغْتَةً وَأَنتُمْ لَا تَشْعُرُونَ

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,

Translation: Saheeh International

Tafsir

And follow the best of what has been revealed to you from your Lord — namely the Qur’ān — before the chastisement comes on you suddenly while you are unaware’ of the time of its arrival until it has actually come;

Excerpt from Tafsir al-Jalalayn, commentary on 39:55, via Quran.com. The reader has the full commentary and 9 more tafsirs.