Sura al-Nisāʾ 4:2

وَءَاتُوا۟ ٱلْيَتَٰمَىٰٓ أَمْوَٰلَهُمْ وَلَا تَتَبَدَّلُوا۟ ٱلْخَبِيثَ بِٱلطَّيِّبِ وَلَا تَأْكُلُوٓا۟ أَمْوَٰلَهُمْ إِلَىٰٓ أَمْوَٰلِكُمْ إِنَّهُۥ كَانَ حُوبًا كَبِيرًا

wa-ātū al-yatāma amwālahum wa-lā tatabaddalū l-khabītha bil-ṭayyibi wa-lā takulū amwālahum ila amwālikum innahu kāna ḥūban kabīran

To orphans restore their property (When they reach their age), nor substitute (your) worthless things for (their) good ones; and devour not their substance (by mixing it up) with your own. For this is indeed a great sin.