Surah Al-Anfal, ayah 28

وَٱعۡلَمُوٓاْ أَنَّمَآ أَمۡوَٰلُكُمۡ وَأَوۡلَٰدُكُمۡ فِتۡنَةٞ وَأَنَّ ٱللَّهَ عِندَهُۥٓ أَجۡرٌ عَظِيمٞ ٢٨

Wa'lamū annamā amwālukum wa awlādukum fitnatun wa annallāha 'indahū ajrun 'azīm

And know that your properties and your children are but a trial and that Allāh has with Him a great reward.