How the Idolators are deceived by their long and luxurious Lives in this World, and the Explanation of the Truth
Allah tells:
بل متعنا هوﻻء وآباءهم حتى طال عليهم العمر
Nay, We gave the luxuries of this life to these men and their fathers until the period grew long for them.
Allah explains that they have been deceived and misled by the luxuries that they enjoy in this world and the long life that they have been given, so they believe that they are following something good.
Then Allah warns them:
أفﻼ يرون أنا نٲتي اﻻرض ننقصها من أطرافها
See they not that We gradually reduce the land (in their control) from its outlying borders!
This is like the Ayah:
ولقد أهلكنا ما حولكم من القرى وصرفنا اﻻيت لعلهم يرجعون
And indeed We have destroyed towns round about you, and We have shown the Ayat in various ways that they might return. (46:27)
Al-Hasan Al-Basri said:
"This means the victory of Islam over disbelief.''
The meaning is: Do they not learn a lesson from the fact that Allah supported those (believers) against their enemies, He destroyed the disbelieving nations and the evil-doing townships, and He saved His believing servants.
So Allah says:
أفهم الغالبون
Is it then they who will overcome!
meaning, on the contrary, they are the ones who will be overcome, who will be defeated, humiliated and brought low