Surah Al-An'am 6:33

قَدْ نَعْلَمُ إِنَّهُۥ لَيَحْزُنُكَ ٱلَّذِى يَقُولُونَ ۖ فَإِنَّهُمْ لَا يُكَذِّبُونَكَ وَلَـٰكِنَّ ٱلظَّـٰلِمِينَ بِـَٔايَـٰتِ ٱللَّهِ يَجْحَدُونَ

We know that you, [O Muḥammad], are saddened by what they say. And indeed, they do not call you untruthful, but it is the verses of Allāh that the wrongdoers reject.

Translation: Saheeh International

Tafsir

We know indeed qad is a confirmative particle that it grieves you that matter which they say to you in denial; yet it is not that they deny you in secret for they know that you are truthful a variant reading for lā yukadhdhibūnaka ‘not that they deny you’ has lā yukdhibūnak that is to say ‘they do not associate you …

Excerpt from Tafsir al-Jalalayn, commentary on 6:33, via Quran.com. The reader has the full commentary and 9 more tafsirs.