﴿ وَإِذِ ٱعْتَزَلْتُمُوهُمْ وَمَا يَعْبُدُونَ إِلَّا ٱللَّهَ فَأْوُۥٓا۟ إِلَى ٱلْكَهْفِ يَنشُرْ لَكُمْ رَبُّكُم مِّن رَّحْمَتِهِۦ وَيُهَيِّئْ لَكُم مِّنْ أَمْرِكُم مِّرْفَقًۭا ﴾

“Hence, now that you have withdrawn from them and from all that they worship instead of God, take refuge in that cave: God will spread His grace over you, and will endow you - whatever your [outward] condition - with all that your souls may need!”

About the verse: فَأْوُوا إِلَى الْكَهْفِ (then seek refuge in the Cave - 16), Ibn Kathir says that the course adopted by the People of Kahf was that they left the city in which it was not possible to worship Allah and took refuge in the Cave. This is the Sunnah, the way of all prophets. They migrate from such places and opt for a place where ` Ibadah could be done.