﴿ بَلْ عَجِبُوٓا۟ أَن جَآءَهُم مُّنذِرٌۭ مِّنْهُمْ فَقَالَ ٱلْكَٰفِرُونَ هَٰذَا شَىْءٌ عَجِيبٌ ﴾

“But nay - they deem it strange that a warner should have come unto them from their own midst; and so these deniers of the truth are saying, “A strange thing is this!”

Please check ayah 50:5 for complete tafsir.