Surah Al-Anfal (The Spoils of War), Verse 28

وَاعْلَمُوْۤا اَنَّمَاۤ اَمْوَالُكُمْ وَاَوْلَادُكُمْ فِتْنَةٌ وَّاَنَّ اللّٰهَ عِنْدَهٗۤ اَجْرٌ عَظِیْمٌ 

Wa'lamooo annamaaa amwaalukum wa awlaadukum fitnatunw wa annal laaha 'indahooo ajrun azeem

“And know ye that your possessions and your progeny are but a trial; and that it is Allah with Whom lies your highest reward.”

Quran 8:28 (Yusuf Ali Translation)