obstinacy in disbelief

وَلَوْ فَتَحْنَا عَلَيْهِم بَابًا مِّنَ ٱلسَّمَآءِ فَظَلُّوا۟ فِيهِ يَعْرُجُونَ

And [even] if We opened to them a gate from the heaven and they continued therein to ascend,

قَالُوٓا۟ إِنَّمَآ أَنتَ مِنَ ٱلْمُسَحَّرِينَ

They said, "You are only of those affected by magic.

فَلَمَّا جَآءَتْهُمْ ءَايَـٰتُنَا مُبْصِرَةً قَالُوا۟ هَـٰذَا سِحْرٌ مُّبِينٌ

But when there came to them Our visible signs, they said, "This is obvious magic."