Abdullah ibn Amr reported: The Messenger of Allah, peace and blessings be upon him, said, “Verily, no prophet came before me but that it was a duty upon him to guide his nation to what he knew was good for them and to warn them of what he knew was evil for them. This nation of yours has been granted well-being in its beginning, but the latter generations will be afflicted with trials and affairs you will recognize as evil. Tribulations will come one after another, and a tribulation will come in which the believer says: This will destroy me! Then it will pass and another tribulation will come in which the believer says: This one, this one! Thus, whoever would love to be delivered from Hellfire and admitted into Paradise, let him meet his end with faith in Allah and the Last Day, and let him treat people as he would love to be treated. Whoever pledges allegiance to a leader should give him the contract of his hand and sincerity of his heart, so let him obey as much as he can. If another leads comes to start rebellion, strike the neck of the other.”
Source: Ṣaḥīḥ Muslim 1844
Grade: Sahih (authentic) according to Muslim
عَنْ عَبْدِ اللَّهِ بْنِ عَمْرٍو قَالَ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ إِنَّهُ لَمْ يَكُنْ نَبِيٌّ قَبْلِي إِلَّا كَانَ حَقًّا عَلَيْهِ أَنْ يَدُلَّ أُمَّتَهُ عَلَى خَيْرِ مَا يَعْلَمُهُ لَهُمْ وَيُنْذِرَهُمْ شَرَّ مَا يَعْلَمُهُ لَهُمْ وَإِنَّ أُمَّتَكُمْ هَذِهِ جُعِلَ عَافِيَتُهَا فِي أَوَّلِهَا وَسَيُصِيبُ آخِرَهَا بَلَاءٌ وَأُمُورٌ تُنْكِرُونَهَا وَتَجِيءُ فِتْنَةٌ فَيُرَقِّقُ بَعْضُهَا بَعْضًا وَتَجِيءُ الْفِتْنَةُ فَيَقُولُ الْمُؤْمِنُ هَذِهِ مُهْلِكَتِي ثُمَّ تَنْكَشِفُ وَتَجِيءُ الْفِتْنَةُ فَيَقُولُ الْمُؤْمِنُ هَذِهِ هَذِهِ فَمَنْ أَحَبَّ أَنْ يُزَحْزَحَ عَنِ النَّارِ وَيُدْخَلَ الْجَنَّةَ فَلْتَأْتِهِ مَنِيَّتُهُ وَهُوَ يُؤْمِنُ بِاللهِ وَالْيَوْمِ الْآخِرِ وَلْيَأْتِ إِلَى النَّاسِ الَّذِي يُحِبُّ أَنْ يُؤْتَى إِلَيْهِ وَمَنْ بَايَعَ إِمَامًا فَأَعْطَاهُ صَفْقَةَ يَدِهِ وَثَمَرَةَ قَلْبِهِ فَلْيُطِعْهُ إِنِ اسْتَطَاعَ فَإِنْ جَاءَ آخَرُ يُنَازِعُهُ فَاضْرِبُوا عُنُقَ الْآخَرِ
1844 صحيح مسلم كتاب الإمارة باب وجوب الوفاء ببيعة الخلفاء الأول فالأول