Al-Kahf 18:9

فَلَعَلَّكَ بَاخِعٌ نَّفْسَكَ عَلَىٰ آثَارِهِمْ إِن لَّمْ يُؤْمِنُوا بِهَـٰذَا الْحَدِيثِ أَسَفًا

Then perhaps you would kill yourself through grief over them, [O Muhammad], if they do not believe in this message, [and] out of sorrow.

إِنَّا جَعَلْنَا مَا عَلَى الْأَرْضِ زِينَةً لَّهَا لِنَبْلُوَهُمْ أَيُّهُمْ أَحْسَنُ عَمَلًا

Indeed, We have made that which is on the earth adornment for it that We may test them [as to] which of them is best in deed.

وَإِنَّا لَجَاعِلُونَ مَا عَلَيْهَا صَعِيدًا جُرُزًا

And indeed, We will make that which is upon it [into] a barren ground.

إِذْ أَوَى الْفِتْيَةُ إِلَى الْكَهْفِ فَقَالُوا رَبَّنَا آتِنَا مِن لَّدُنكَ رَحْمَةً وَهَيِّئْ لَنَا مِنْ أَمْرِنَا رَشَدًا

[Mention] when the youths retreated to the cave and said, "Our Lord, grant us from Yourself mercy and prepare for us from our affair right guidance."

فَضَرَبْنَا عَلَىٰ آذَانِهِمْ فِي الْكَهْفِ سِنِينَ عَدَدًا

So We cast [a cover of sleep] over their ears within the cave for a number of years.

ثُمَّ بَعَثْنَاهُمْ لِنَعْلَمَ أَيُّ الْحِزْبَيْنِ أَحْصَىٰ لِمَا لَبِثُوا أَمَدًا

Then We awakened them that We might show which of the two factions was most precise in calculating what [extent] they had remained in time.