When the people of Medina dethroned Yazid bin Muawiya, Ibn ʿUmar gathered his special friends and children and said, "I heard the Prophet ﷺ saying, 'A flag will be fixed for every betrayer on the Day of Resurrection,' and we have given the oath of allegiance to this person (Yazid) in accordance with the conditions enjoined by Allah and His Apostle and I do not know of anything more faithless than fighting a person who has been given the oath of allegiance in accordance with the conditions enjoined by Allah and His Apostle , and if ever I learn that any person among you has agreed to dethrone Yazid, by giving the oath of allegiance (to somebody else) then there will be separation between him and me."  

سَمِعْتُ النَّبِيَّ ﷺ يَقُولُ يُنْصَبُ لِكُلِّ غَادِرٍ لِوَاءٌ يَوْمَ الْقِيَامَةِ وَإِنَّا قَدْ بَايَعْنَا هَذَا الرَّجُلَ عَلَى بَيْعِ اللَّهِ وَرَسُولِهِ وَإِنِّي لاَ أَعْلَمُ غَدْرًا أَعْظَمَ مِنْ أَنْ يُبَايَعَ رَجُلٌ عَلَى بَيْعِ اللَّهِ وَرَسُولِهِ ثُمَّ يُنْصَبُ لَهُ الْقِتَالُ وَإِنِّي لاَ أَعْلَمُ أَحَدًا مِنْكُمْ خَلَعَهُ وَلاَ بَايَعَ فِي هَذَا الأَمْرِ إِلاَّ كَانَتِ الْفَيْصَلَ بَيْنِي وَبَيْنَهُ  

When Ibn Ziyad and Marwan were in Sham and Ibn Az-Zubair took over the authority in Mecca and Qurra' (the Kharijites) revolted in Basra, I went out with my father to Abu Barza Al-Aslami till we entered upon him in his house while he was sitting in the shade of a room built of cane. So we sat with him and my father started talking to him saying, "O Abu Barza! Don't you see in what dilemma the people has fallen?" The first thing heard him saying "I seek reward from Allah for myself because of being angry and scornful at the Quraish tribe. O you Arabs! You know very well that you were in misery and were few in number and misguided, and that Allah has brought you out of all that with Islam and with Muhammad till He brought you to this state (of prosperity and happiness) which you see now; and it is this worldly wealth and pleasures which has caused mischief to appear among you. The one who is in Sham (i.e., Marwan), by Allah, is not fighting except for the sake of worldly gain: and those who are among you, by Allah, are not fighting except for the sake of worldly gain; and that one who is in Mecca (i.e., Ibn Az-Zubair) by Allah, is not fighting except for the sake of worldly gain."  

يَا أَبَا بَرْزَةَ أَلاَ تَرَى مَا وَقَعَ فِيهِ النَّاسُ فَأَوَّلُ شَىْءٍ سَمِعْتُهُ تَكَلَّمَ بِهِ إِنِّي احْتَسَبْتُ عِنْدَ اللَّهِ أَنِّي أَصْبَحْتُ سَاخِطًا عَلَى أَحْيَاءِ قُرَيْشٍ إِنَّكُمْ يَا مَعْشَرَ الْعَرَبِ كُنْتُمْ عَلَى الْحَالِ الَّذِي عَلِمْتُمْ مِنَ الذِّلَّةِ وَالْقِلَّةِ وَالضَّلاَلَةِ وَإِنَّ اللَّهَ أَنْقَذَكُمْ بِالإِسْلاَمِ وَبِمُحَمَّدٍ ﷺ حَتَّى بَلَغَ بِكُمْ مَا تَرَوْنَ وَهَذِهِ الدُّنْيَا الَّتِي أَفْسَدَتْ بَيْنَكُمْ إِنَّ ذَاكَ الَّذِي بِالشَّأْمِ وَاللَّهِ إِنْ يُقَاتِلُ إِلاَّ عَلَى الدُّنْيَا  

Hudhaifa bin Al-Yaman said, 'The hypocrites of today are worse than those of the lifetime of the Prophet, because in those days they used to do evil deeds secretly but today they do such deeds openly.'  

إِنَّ الْمُنَافِقِينَ الْيَوْمَ شَرٌّ مِنْهُمْ عَلَى عَهْدِ النَّبِيِّ ﷺ كَانُوا يَوْمَئِذٍ يُسِرُّونَ وَالْيَوْمَ يَجْهَرُونَ  

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