Tafsir of Fatir 35:26

ثم أخذت الذين كفروا

Then I took hold of those who disbelieved, means, `despite all of this, they denied the Messengers and the Message they brought, so I seized them, i.e., with My punishment.'

فكيف كان نكير

and how terrible was My denial! means, how great and intense and terrible do you think My punishment was? And Allah knows best