Distinction between faith and disbelief

وَلَمَّا جَآءَ أَمْرُنَا نَجَّيْنَا هُودًا وَٱلَّذِينَ ءَامَنُوا۟ مَعَهُۥ بِرَحْمَةٍ مِّنَّا وَنَجَّيْنَـٰهُم مِّنْ عَذَابٍ غَلِيظٍ

And when Our command came, We saved Hūd and those who believed with him, by mercy from Us; and We saved them from a harsh punishment.