Al-Anfal 8:13

Thalika bi-annahum shaqqoo Allahawarasoolahu waman yushaqiqi Allaha warasoolahufa-inna Allaha shadeedu alAAiqab

That is because they opposed Allāh and His Messenger. And whoever opposes Allāh and His Messenger - indeed, Allāh is severe in penalty.

That is because they were hostile to Allah and His Messenger; and whoever becomes hostile to Allah and His Messenger, then, Allah is severe at punishment.