﴿ وَقَالَ ٱلَّذِينَ كَفَرُوا۟ لِلَّذِينَ ءَامَنُوا۟ لَوْ كَانَ خَيْرًۭا مَّا سَبَقُونَآ إِلَيْهِ ۚ وَإِذْ لَمْ يَهْتَدُوا۟ بِهِۦ فَسَيَقُولُونَ هَٰذَآ إِفْكٌۭ قَدِيمٌۭ ﴾

“But they who are bent on denying the truth speak thus of those who have attained to faith: “If this [message] were any good, these [people] would not have preceded us in accepting it!” And since they refuse to be guided by it, they will always say, “This is [but] an ancient falsehood!””

Please check ayah 46:14 for complete tafsir.