Question

And We certainly know that they say, ''It is only a human being who teaches him [i.e., the Prophet (ﷺ)].'' The tongue of the one they refer to is foreign,[715] and this [recitation, i.e., Qur’ān] is [in] a clear Arabic language. وَلَقَدْ نَعْلَمُ أَنَّهُمْ يَقُولُونَ إِنَّمَا يُعَلِّمُهُۥ بَشَرٌ لِّسَانُ ٱلَّذِى يُلْحِدُونَ إِلَيْهِ أَعْجَمِىٌّ وَهَٰذَا لِسَانٌ عَرَبِىٌّ مُّبِينٌ 103

Accepted Answer

[715] Having seen the Prophet (ﷺ) speaking with a foreign man on occasion, the Quraysh accused him of repeating the man's words. an-Nahl Part 14

Translation	And We certainly know that they say, ''It is only a human being who teaches him [i.e., the Prophet (ﷺ)].'' The tongue of the one they refer to is foreign,[715] and this [recitation, i.e., Qur’ān] is [in] a clear Arabic language.
Footnote	[715] Having seen the Prophet (ﷺ) speaking with a foreign man on occasion, the Quraysh accused him of repeating the man's words.
Ayah	وَلَقَدْ نَعْلَمُ أَنَّهُمْ يَقُولُونَ إِنَّمَا يُعَلِّمُهُۥ بَشَرٌ لِّسَانُ ٱلَّذِى يُلْحِدُونَ إِلَيْهِ أَعْجَمِىٌّ وَهَٰذَا لِسَانٌ عَرَبِىٌّ مُّبِينٌ
Sorh	an-Nahl
AyahN	103
Part	Part 14

Prophet Human Teaches I.E ﷺ Tongue Refer Foreign,[715