Surah Ar-Rahman 55:4
عَلَّمَهُ ٱلْبَيَانَ
[And] taught him eloquence.
Translation: Saheeh International
Tafsir
teaching him the coherent speech utterance.
Excerpt from Tafsir al-Jalalayn, commentary on 55:4, via Quran.com. The reader has the full commentary and 9 more tafsirs.