Surah Ad-Duhaa 93:9
فَأَمَّا ٱلْيَتِيمَ فَلَا تَقْهَرْ
So as for the orphan, do not oppress [him].
Translation: Saheeh International
Tafsir
So as for the orphan do not oppress him by appropriating his wealth or otherwise
Excerpt from Tafsir al-Jalalayn, commentary on 93:9, via Quran.com. The reader has the full commentary and 9 more tafsirs.