Quran 7:66 — The Purgatory (Al-A'araf)

قالَ المَلَأُ الَّذينَ كَفَروا مِن قَومِهِ إِنّا لَنَرىٰكَ فى سَفاهَةٍ وَإِنّا لَنَظُنُّكَ مِنَ الكٰذِبينَ

The leaders who disbelieved among his people said, "We see that you are behaving foolishly, and we think that you are a liar."

[7:65] To 'Ãd we sent their brother Hûd. He said, "O my people, worship GOD; you have no other god beside Him. Would you then observe righteousness?"

[7:67] He said, "O my people, there is no foolishness in me; I am a messenger from the Lord of the universe.