وَآتُواْ الْيَتَامَى أَمْوَالَهُمْ وَلاَ تَتَبَدَّلُواْ الْخَبِيثَ بِالطَّيِّبِ وَلاَ تَأْكُلُواْ أَمْوَالَهُمْ إِلَى أَمْوَالِكُمْ إِنَّهُ كَانَ حُوبًا كَبِيرًا
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سورة النساء
(4/2) And give to the orphans their property, do not exchange the clean (permissible) for the bad (prohibited) and do not consume their property (by adding it) to your own property; this is surely a great sin.
Surah An-Nisa