When the people of Medina dethroned Yazid bin Muawiya, Ibn `Umar 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."
Sahih al-Bukhari Book 92, Hadith 58
← Previous Hadith (Usama's Maula) Usama (bin Zaid) sent me to `Ali (at Kufa) and said, "`Ali will ask you, 'What has prevented your companion from joining me?' You then should say to him, 'If you (`Ali) were in the mouth of a lion, I would like to be with you, but in this matter I won't take any part.' " Harmala added: "`Ali didn't give me anything (when I conveyed the message to him) so I went to Hasan, Hussain and Ibn Ja`far and they loaded my camels with much (wealth).

Sahih al-Bukhari Book 92, Hadith 57 Next Hadith → 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."

Sahih al-Bukhari Book 92, Hadith 59