ٱلنَّحْل : ١٠٣

  • وَلَقَدۡ And certainly
  • نَعۡلَمُ We know
  • أَنَّهُمۡ that they
  • يَقُولُونَ say
  • إِنَّمَا Only
  • يُعَلِّمُهُۥ teaches him
  • بَشَرٞۗ a human being
  • لِّسَانُ (The) tongue
  • ٱلَّذِي (of) the one
  • يُلۡحِدُونَ they refer
  • إِلَيۡهِ to him
  • أَعۡجَمِيّٞ (is) foreign
  • وَهَٰذَا while this
  • لِسَانٌ (is) a language
  • عَرَبِيّٞ Arabic
  • مُّبِينٌ clear
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,1 and this [recitation, i.e., Qur’ān] is [in] a clear Arabic language.
Footnotes
1 - Having seen the Prophet (ﷺ) speaking with a foreign man on occasion, the Quraysh accused him of repeating the man's words.
And verily (wa-laqad is for confirmation) We know that they say, 'It is only a human that is teaching him, the Qur'aan' - this was a Christian blacksmith whom the Prophet may peace and salutation be upon him 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'aan, is [in] a clear Arabic tongue, one of lucidity and clarity: so how can a foreigner be teaching him?