Tafsir of Ghafir 40:30-31

{Like the day of the confederates} It means like their days. Because when he attributed it to the "confederates" and explained them as the people of Noah, ‘Ad, and Thamud—and it is clear that every party among them had a day of destruction—he sufficed with the singular instead of the plural. This is because the noun to which it is attributed makes the plural unnecessary, as in the poet’s saying: "Eat in some of your belly and you will be satisfied."

Al-Zajjaj said: "Like the day of a party [like] a party." And {the habit} refers to their habit in their work of disbelief, denial, and other sins, and that this was a constant, habitual state for them from which they did not falter. It is necessary to assume an omitted genitive, meaning: "Like the recompense of their habit."

If you ask: "By what is the second 'like' (mithl) governed in the accusative case?" I say: It is an explanatory apposition (‘atf bayan) to the first "like." Because the last thing the attribution encompassed was the people of Noah. If you were to say, "God destroyed the confederates: the people of Noah, ‘Ad, and Thamud," it would be nothing but an explanatory apposition for the attribution of "people" to proper names. This ruling extends to the first thing the attribution encompassed.

{And God does not want injustice for the servants} Meaning: Their destruction was justice and fairness, because they deserved it through their deeds. This is more emphatic than His saying, "And your Lord is not unjust to the servants," because here the negation is directed at the will to commit injustice. Whoever is far from the will to commit injustice is even further from the injustice itself. By using the indefinite "injustice," it is as if He negated the desire for any injustice whatsoever for His servants. It is also possible that the meaning is like His saying, "And He does not approve of disbelief for His servants," meaning: He does not want them to be unjust; He destroyed them because they were unjust.

{And O my people, indeed I fear for you the Day of Calling out. The Day you will turn your backs, fleeing; you will have no protector from God. And whoever God leaves astray, there is no guide for him.}