Al-Kahf - 18:7

إِنَّا جَعَلْنَا مَا عَلَى الْأَرْضِ زِينَةً لَّهَا لِنَبْلُوَهُمْ أَيُّهُمْ أَحْسَنُ عَمَلًا
[18:7]
Surely We have made whatever is on the earth an embellishment for it, so that We may try them (as to) which of them is best in works.
That which is on earth we have made but as a glittering show for the earth, in order that We may test them - as to which of them are best in conduct.
Lo! We have placed all that is on the earth as an ornament thereof that We may try them: which of them is best in conduct.