التفسير التبليغي
(بَلْ الَّذِينَ كَفَرُوا فِي تَكْذِيبٍ)
This indicates the denial of those who reject the people of truth.
(بَلِ الَّذِينَ كَفَرُوا فِي تَكْذِيبٍ) Such is their constant state; they are in an unbroken chain of denial of everything they hear from Allah's verses, without listening attentively to what they hear or comprehending it.
(بَلِ الَّذِينَ كَفَرُوا فِي تَكْذِيبٍ) out of their preference for their own desires and their adherence to the ways of their forefathers.
(فِي تَكْذِيبٍ) out of envy towards you!
(بَلِ الَّذِينَ كَفَرُوا فِي تَكْذِيبٍ) They did not learn from what befell those before them.
When they denied the blessings of Allah - the Exalted - He did not grant them success in believing in Him.
Source: التفسير التبليغي