he lied / he denied the truth
Form I verb. Past: كَذَبَ, Present: يَكْذِبُ. Form II: كَذَّبَ (to call a liar, to deny). Related: كَذِبٌ (lie), كَاذِبٌ (liar), مُكَذِّبٌ (denier).
The refrain 'woe to the deniers' is repeated ten times in Surah Al-Mursalāt (77), creating a powerful rhetorical impact.