A Reminder to Them of their Circumstances and the Blessings
They enjoyed Salih preached to them, warning them that the punishment of Allah could overtake them and reminding them of the blessings that Allah had bestowed upon them, by giving them ample provision and making them safe from all kinds of dangers, giving them gardens and flowing springs, and bringing forth for them crops and fruits.
وَنَخْلٍ طَلْعُهَا هَضِيمٌ
(and date palms with soft clusters.) Al-`Awfi narrated from Ibn `Abbas, "Ripe and rich." `Ali bin Abi Talhah narrated from Ibn `Abbas that this meant growing luxuriantly. Isma`il bin Abi Khalid narrated from `Amr bin Abi `Amr -- who met the Companions -- from Ibn `Abbas that this means, "When it becomes ripe and soft." This was narrated by Ibn Abi Hatim, then he said: "And something similar was narrated from Abu Salih."
وَتَنْحِتُونَ مِنَ الْجِبَالِ بُيُوتًا فَارِهِينَ ﴿149﴾And you hew out houses from the hills with pride. [ 149]
According to Sayyidna Ibn ` Abbas ؓ ، the word فَارِهِينَ (Farihin) means arrogant and conceited people. But Abu Salih and Imam Raghib have taken this word to mean experts. Therefore, the meaning of the verse is that Allah Ta’ ala has favoured you by teaching such skills that you could make houses by cutting hills. The essence of all this is that you should remember the bounties of Allah Ta’ ala and should not make mischief and trouble on earth.
Useful vocations are Divine Graces provided they are not employed in bad things
This verse indicates that nice vocations are Allah's Graces, and to draw benefit from them is lawful. But if they are used for some sinful purpose or in an unlawful act, or if someone gets involved in them with unnecessary concentration, then it is not lawful to adopt them. An example of unnecessary construction of tall buildings and its contempt has just been mentioned in the previous verses.
Tazkirul Quran
Maulana Wahiduddin KhanOn ayahs 140–151
The false self-confidence of the ‘Ad community prevented them from accepting the preaching of their prophet and they went to the extent of ridiculing it. They took their prosperity in the world as God’s reward. They failed to understand the secret that man is given worldly effects by way of trial and not because he deserves them. When it was finally established that they were not going to accept the Truth, God had them lashed by stormy winds and heavy rains, which continued to wreak havoc for a week. The result was that the entire nation with its grand culture was destroyed. Now, the only sign of this nation, whose land had once been fertile and well populated is the desert which stretches far and wide between the present-day Oman and Yemen.
Uthmani text of the Madinah mushaf (King Fahd Complex). Translation: Saheeh International. Tafsir via Quran.com.