Verse 166

لَّـٰكِنِ ٱللَّهُ يَشْهَدُ بِمَآ أَنزَلَ إِلَيْكَ أَنزَلَهُۥ بِعِلْمِهِۦ وَٱلْمَلَـٰٓئِكَةُ يَشْهَدُونَ وَكَفَىٰ بِٱللَّهِ شَهِيدًا

However, God witnesses what He reveals to you. He reveals it according to His knowledge. The angels witness it as well. However, God suffices as a witness.