Dr. Mustafa Khattab, the Clear Quran - Surah An-Nahl, ayah 103

Translation of Surah An-Nahl, ayah 103 (16:103)

وَلَقَدۡ نَعۡلَمُ أَنَّهُمۡ يَقُولُونَ إِنَّمَا يُعَلِّمُهُۥ بَشَرٞۗ لِّسَانُ ٱلَّذِي يُلۡحِدُونَ إِلَيۡهِ أَعۡجَمِيّٞ وَهَٰذَا لِسَانٌ عَرَبِيّٞ مُّبِينٌ ١٠٣
And We surely know that they say, “No one is teaching him except a human.” But the man they refer to speaks a foreign tongue, whereas this ˹Quran˺ is ˹in˺ eloquent Arabic.1

Foot notes

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Some Meccan pagans claimed that the Prophet (ﷺ) received the Quran from a non-Arab slave owned by an Arab pagan.