﴿ قَدْ نَعْلَمُ إِنَّهُۥ لَيَحْزُنُكَ ٱلَّذِى يَقُولُونَ ۖ فَإِنَّهُمْ لَا يُكَذِّبُونَكَ وَلَٰكِنَّ ٱلظَّٰلِمِينَ بِـَٔايَٰتِ ٱللَّهِ يَجْحَدُونَ ﴾

“Well do We know that what such people say grieves thee indeed: yet, behold, it is not thee to whom they give the lie, but God's messages do these evildoers deny.”

(We know well how their talk) their slander, denial and demand for proofs (grieveth thee) O Muhammad, (though in truth they) i.e. al-Harth Ibn 'Amir and his followers (deny not thee (Muhammad)) inwardly (but evil-doers) the idolaters (flout the revelations of Allah) quite openly.