Surah Al-Isra' (The Night Journey), Verse 34

وَلَا تَقْرَبُوْا مَالَ الْیَتِیْمِ اِلَّا بِالَّتِیْ هِیَ اَحْسَنُ حَتّٰی یَبْلُغَ اَشُدَّهٗ وَاَوْفُوْا بِالْعَهْدِ اِنَّ الْعَهْدَ كَانَ مَسْـُٔوْلًا ۟

Wa laa taqraboo maalal yateemi illaa billatee hiya ahsanu hattaa yablugha ashuddah; wa awfoo bil'ahd, innal 'ahda kaana mas'oolaa

“Come not nigh to the orphan's property except to improve it, until he attains the age of full strength; and fulfil (every) engagement, for (every) engagement will be enquired into (on the Day of Reckoning).”

Quran 17:34 (Yusuf Ali Translation)