Contrast between outward profession and inward action

وَإِذَا تَوَلَّىٰ سَعَىٰ فِى ٱلْأَرْضِ لِيُفْسِدَ فِيهَا وَيُهْلِكَ ٱلْحَرْثَ وَٱلنَّسْلَ ۗ وَٱللَّهُ لَا يُحِبُّ ٱلْفَسَادَ

And when he goes away, he strives throughout the land to cause corruption therein and destroy crops and animals. And Allāh does not like corruption.