4:166
لَّٰكِنِ ٱللَّهُ يَشْهَدُ بِمَآ أَنزَلَ إِلَيْكَ ۖ أَنزَلَهُۥ بِعِلْمِهِۦ ۖ وَٱلْمَلَٰٓئِكَةُ يَشْهَدُونَ ۚ وَكَفَىٰ بِٱللَّهِ شَهِيدًا
But Allah bears witness to that which He has revealed to you. He has sent it down with His knowledge, and the angels bear witness [as well]. And sufficient is Allah as Witness.
Translation · Saheeh International
Tafsir
Ibn Kathīr (abridged)
إِنَّآ أَوْحَيْنَآ إِلَيْكَ
(Verily, We have inspired you...) emphasized the Prophet's prophethood and refuted the idolators and People of the Scripture who denied him. Allah said,
لَّـكِنِ اللَّهُ يَشْهَدُ بِمَآ أَنزَلَ إِلَيْكَ
(But Allah bears witness to that which He has sent down unto you,) meaning, even if they deny, defy and disbelieve in you, O Muhammad, Allah testifies that you are His Messenger to whom He sent down His Book, the Glorious Qur'an that,
لاَّ يَأْتِيهِ الْبَـطِلُ مِن بَيْنِ يَدَيْهِ وَلاَ مِنْ خَلْفِهِ تَنزِيلٌ مِّنْ حَكِيمٍ حَمِيدٍ
(Falsehood cannot come to it from before it or behind it, (it is) sent down by the All-Wise, Worthy of all praise.) Allah then said,