The Story of Hud, Peace be upon Him, and the Lineage of the People of `Ad
Allah says, just as We sent Nuh to his people, similarly, to the `Ad people, We sent Hud one of their own brethren. Muhammad bin Ishaq said that the tribe of `Ad were the descendants of `Ad, son of Iram, son of `Aws, son of Sam, son of Nuh. I say, these are indeed the ancient people of `Ad whom Allah mentioned, the children of `Ad, son of Iram who were living in the deserts with lofty pillars or statues. Allah said,
(Have you not seen how your Lord dealt with `Ad (people). Of Iram like (lofty) pillars. The like of which were not created in the land) 89:6-8 because of their might and strength. Allah said in another instance,
(2)-In the second verse (66), it was said: قَالَ الْمَلَأُ الَّذِينَ كَفَرُوا مِن قَوْمِهِ إِنَّا لَنَرَاكَ فِي سَفَاهَةٍ وَإِنَّا لَنَظُنُّكَ مِنَ الْكَاذِبِينَ ﴿66﴾ (Said the chiefs of his people who disbelieved, "Indeed, We see you in foolishness, and we certainly believe you to be one of the liars." This stance taken in opposition here resembles the one taken by the people of Sayyidna Nuh (علیہ السلام) . The only difference is that of some words.
Tazkirul Quran
Maulana Wahiduddin KhanOn ayahs 65–67
Iram, Noah’s grandson was one of the believers who were saved in Noah’s Ark. He was the forefather of a tribe known as ‘Ad. These people, settled in Yemen, were initially adherents of the religion of Noah. But later on when they strayed from the right path, God appointed Hud to be their prophet. But in the eyes of the leaders of the community, he did not appear to possess that greatness which they thought should inhere in prophets. So they felt that either he was a fool or that he was making a false claim.
Uthmani text of the Madinah mushaf (King Fahd Complex). Translation: Saheeh International. Tafsir via Quran.com.