﴿ وَٱتَّبِعُوٓا۟ أَحْسَنَ مَآ أُنزِلَ إِلَيْكُم مِّن رَّبِّكُم مِّن قَبْلِ أَن يَأْتِيَكُمُ ٱلْعَذَابُ بَغْتَةًۭ وَأَنتُمْ لَا تَشْعُرُونَ ﴾

“And ere that suffering comes upon you of a sudden, without your being aware [of its approach], follow the most goodly [teaching] that has been revealed unto you by your Sustainer,”

Please check ayah 39:59 for complete tafsir.