Surat Al Anfal: (27-28)

{يَا أَيُّهَا الَّذِينَ آمَنُواْ لاَ تَخُونُواْ اللّهَ وَالرَّسُولَ وَتَخُونُواْ أَمَانَاتِكُمْ وَأَنتُمْ تَعْلَمُونَ} [الأنفال: 27]

27- O believers, do not betray Allah and His Messenger by leaving out what they commanded you. Deliver trusts to their owners, and do not go easy with the rulings which Allah ordained for you to organize your conditions, but perform them as they should, for you know the bad consequences of sins.

{وَاعْلَمُواْ أَنَّمَا أَمْوَالُكُمْ وَأَوْلاَدُكُمْ فِتْنَةٌ وَأَنَّ اللّهَ عِندَهُ أَجْرٌ عَظِيمٌ} [الأنفال: 28]

28- O believers, know that your properties and children are just a test for you from Allah to see whether you shall obey Him and thank Him for or you show miserliness and be busy with them and with the adornments of the world?

However, Allah has the great reward for those who show sincerity, preferred His Satisfaction, and abided by His Limits.