Hudhaifa said, 'In fact, it was hypocrisy that existed in the lifetime of the Prophet ﷺ but today it is Kufr (disbelief) after belief.'
إِنَّمَا كَانَ النِّفَاقُ عَلَى عَهْدِ النَّبِيِّ ﷺ فَأَمَّا الْيَوْمَ فَإِنَّمَا هُوَ الْكُفْرُ بَعْدَ الإِيمَانِ