Surah Al-Anfal — Ayah 28 (8:28)
وَٱعۡلَمُوٓاْ أَنَّمَآ أَمۡوَٰلُكُمۡ وَأَوۡلَٰدُكُمۡ فِتۡنَةٞ وَأَنَّ ٱللَّهَ عِندَهُۥٓ أَجۡرٌ عَظِيمٞ ٢٨
English translation (Saheeh International)
And know that your properties and your children are but a trial and that Allāh has with Him a great reward.
Brief commentary
Be aware O believers that your wealth and children are a test for you, and your conduct with them may prevent you from performing good actions for your Afterlife, or lead to betraying your trusts. Know that with Allah is a great reward, so be careful not to lose this reward because of becoming engrossed with them, and you cheating the people because of them.