﴿ ذَٰلِكَ بِأَنَّهُمْ قَالُوا۟ لَن تَمَسَّنَا ٱلنَّارُ إِلَّآ أَيَّامًۭا مَّعْدُودَٰتٍۢ ۖ وَغَرَّهُمْ فِى دِينِهِم مَّا كَانُوا۟ يَفْتَرُونَ ﴾

“simply because they claim, "The fire will most certainly not touch us for more than a limited number of days": and thus the false beliefs which they invented have [in time] caused them to betray their faith.”

Please check ayah 3:25 for complete tafsir.