The fact is that We have conveyed to them the truth but for sure they are the liars (in their assertions, denial of the pillars of faith, and against their own selves)
Nay, We have given them the Truth, yet, behold, they are intent upon lying to themselves. (Acceptance of His Rule in their lives hurts their vested interests (21:20), (23:70))
No, We came to them as the Truth... They are liars indeed.
Sayyed Abbas Sadr-Ameli
Nay, We have brought them the Truth, and verily they are liars
Al-muntakhab fi tafsir al-Qur'an al-Karim
But We have constantly presented to them the truth at the hands of all the Messengers but they persistently counterchange the truth with falsehood and lie in their teeth