Translation of the verse 12 from Surah Al-hijr : Number of verses 99 - - page 262 - Part 14.
Thus do We let it (polytheism and disbelief) enter into the hearts of the Mujrimun [criminals, polytheists, pagans, etc. (because of their mockery at the Messengers)].
Thus do We insert denial into the hearts of the criminals.
(15:12) Though We cause it (Admonition) to enter into their hearts (like a rod),
Source : Al-hijr Verse 12: Thus do We insert denial into the hearts of the criminals.