﴿ وَلَقَدْ نَعْلَمُ أَنَّهُمْ يَقُولُونَ إِنَّمَا يُعَلِّمُهُۥ بَشَرٌۭ ۗ لِّسَانُ ٱلَّذِى يُلْحِدُونَ إِلَيْهِ أَعْجَمِىٌّۭ وَهَٰذَا لِسَانٌ عَرَبِىٌّۭ مُّبِينٌ ﴾

“And, indeed, full well do We know that they say, "It is but a human being that imparts [all] this to him! -[notwithstanding that] the tongue of him to whom they so maliciously point is wholly outlandish, whereas this is Arabic speech, clear [in itself] and clearly showing the truth [of its source].”

And verily wa-laqad is for confirmation We know that they say ‘It is only a human that is teaching him the Qur’ān’ — this was a Christian blacksmith whom the Prophet s used to frequent. God exalted be He says The tongue the language of him to whom they refer to whom they incline with the accusation that he is the one teaching him is foreign’; while this Qur’ān is in a clear Arabic tongue one of lucidity and clarity so how can a foreigner be teaching him?