Mishkat al-Masabih
Mishkat al-Masabih 62
Arabic hadith text
وَعَن حُذَيْفَة قَالَ: إِنَّمَا كَانَ النِّفَاق عَلَى عَهْدِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَأَمَّا الْيَوْمَ فَإِنَّمَا هُوَ الْكفْر بعد الايمان. رَوَاهُ البُخَارِيّ
Translation
Hudhayfa said, “Hypocrisy existed only during the time of the Prophet. As for today, it is only disbelief after faith.” Bukhari transmitted it.