The Heights
قَالَ ٱلْمَلَأُ ٱلَّذِينَ كَفَرُوا۟ مِن قَوْمِهِۦٓ إِنَّا لَنَرَىٰكَ فِى سَفَاهَةٍ وَإِنَّا لَنَظُنُّكَ مِنَ ٱلْكَـٰذِبِينَ
Said the eminent ones who disbelieved among his people, "Indeed, we see you in foolishness, and indeed, we think you are of the liars."
Nearby ayahs help place verse 7:66 in sequence and meaning.
فَكَذَّبُوهُ فَأَنجَيْنَـٰهُ وَٱلَّذِينَ مَعَهُۥ فِى ٱلْفُلْكِ وَأَغْرَقْنَا ٱلَّذِينَ كَذَّبُوا۟ بِـَٔايَـٰتِنَآ ۚ إِنَّهُمْ كَانُوا۟ قَوْمًا عَمِينَ
But they denied him, so We saved him and those who were with him in the ship. And We drowned those who denied Our signs. Indeed, they were a blind people.
۞ وَإِلَىٰ عَادٍ أَخَاهُمْ هُودًا ۗ قَالَ يَـٰقَوْمِ ٱعْبُدُوا۟ ٱللَّهَ مَا لَكُم مِّنْ إِلَـٰهٍ غَيْرُهُۥٓ ۚ أَفَلَا تَتَّقُونَ
And to the 'Aad [We sent] their brother Hud. He said, "O my people, worship Allah; you have no deity other than Him. Then will you not fear Him?"
قَالَ يَـٰقَوْمِ لَيْسَ بِى سَفَاهَةٌ وَلَـٰكِنِّى رَسُولٌ مِّن رَّبِّ ٱلْعَـٰلَمِينَ
[Hud] said, "O my people, there is not foolishness in me, but I am a messenger from the Lord of the worlds."
أُبَلِّغُكُمْ رِسَـٰلَـٰتِ رَبِّى وَأَنَا۠ لَكُمْ نَاصِحٌ أَمِينٌ
I convey to you the messages of my Lord, and I am to you a trustworthy adviser.