Qur'an 18:7 · Al-Kahf

إِنَّا جَعَلْنَا مَا عَلَى ٱلْأَرْضِ زِينَةًۭ لَّهَا لِنَبْلُوَهُمْ أَيُّهُمْ أَحْسَنُ عَمَلًۭا

(7) 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.