Quran 68:17-32 – What Is Supposed To Be The Impact Of Saying InshaAllah?
Perhaps you refer to the verses: 68: 17-32. Here the mention of Insha Allah is not telling the cause of destruction, but their being neglecful of God that they in their vow they did not bother to say Insha Allah. It does not say that since they did not say those words, that was why there were destroyed. They were not just harvesting, they wanted to avoid poor people who might come to beg. They were destroyed for thier ingrateful attitude.