Sahih Bukhari Volume 6, Book 65, Hadith 4604

حَدَّثَنَا عُمَرُ بْنُ حَفْصٍ، حَدَّثَنَا أَبِي، حَدَّثَنَا الأَعْمَشُ، قَالَ حَدَّثَنِي إِبْرَاهِيمُ، عَنِ الأَسْوَدِ، قَالَ كُنَّا فِي حَلْقَةِ عَبْدِ اللَّهِ فَجَاءَ حُذَيْفَةُ حَتَّى قَامَ عَلَيْنَا، فَسَلَّمَ ثُمَّ قَالَ لَقَدْ أُنْزِلَ النِّفَاقُ عَلَى قَوْمٍ خَيْرٍ مِنْكُمْ‏.‏ قَالَ الأَسْوَدُ سُبْحَانَ اللَّهِ، إِنَّ اللَّهَ يَقُولُ ‏{‏إِنَّ الْمُنَافِقِينَ فِي الدَّرَكِ الأَسْفَلِ مِنَ النَّارِ‏}‏ فَتَبَسَّمَ عَبْدُ اللَّهِ، وَجَلَسَ حُذَيْفَةُ فِي نَاحِيَةِ الْمَسْجِدِ، فَقَامَ عَبْدُ اللَّهِ فَتَفَرَّقَ أَصْحَابُهُ، فَرَمَانِي بِالْحَصَا، فَأَتَيْتُهُ فَقَالَ حُذَيْفَةُ عَجِبْتُ مِنْ ضَحِكِهِ، وَقَدْ عَرَفَ مَا قُلْتُ، لَقَدْ أُنْزِلَ النِّفَاقُ عَلَى قَوْمٍ كَانُوا خَيْرًا مِنْكُمْ، ثُمَّ تَابُوا فَتَابَ اللَّهُ عَلَيْهِمْ‏.‏

Narrated By Al-Aswad : While we were sitting in a circle in 'Abdullah's gathering, Hudhaifa came and stopped before us, and greeted us and then said, "People better than you became hypocrites." Al-Aswad said: I testify the uniqueness of Allah! Allah says: "Verily! The hypocrites will be in the lowest depths of the Fire." (4.145) On that 'Abdullah smiled and Hudhaifa sat somewhere in the Mosque. 'Abdullah then got up and his companions (sitting around him) dispersed. Hudhaifa then threw a pebble at me (to attract my attention). I went to him and he said, "I was surprised at 'Abdullah's smile though he understood what I said. Verily, people better than you became hypocrite and then repented and Allah forgave them."