Abdullah bin Amr bin As reported,

The Messenger of Allah ﷺ said, "There has never been a prophet before me except that it was his duty to guide his community to the best of what he knew for them and to warn them against the worst of what he knew for them. As for this community of yours, its well-being has been placed in its earliest generation, while its later generations will be afflicted with trials and matters that you will find objectionable. Tribulations will come, one making the next seem light by comparison. A tribulation will come and the believer will say, 'This will be my destruction,' then it will pass. Then another tribulation will come and the believer will say, 'This one, this one is it.'Whoever wishes to be removed far from the Fire and admitted into the Garden, let death come to him while he believes in Allah and the Last Day, and let him treat people the way he would love to be treated. Whoever pledges allegiance to a leader and gives him the clasp of his hand and the fruit of his heart, let him obey him if he is able. If another comes seeking to dispute his authority, then strike the neck of the latter."

عن عبد الله بن عمرو بن العاص قال

قال رسول الله ﷺ إنه لم يكن نبي قبلي إلا كان حقا عليه أن يدل أمته على خير ما يعلمه لهم وينذرهم شر ما يعلمه لهم، وإن أمتكم هذه جعل عافيتها في أولها، وسيصيب آخرها بلاء، وأمور تنكرونها وتجيء فتنة، فيرقق بعضها بعضا، وتجيء الفتنة، فيقول المؤمن هذه مهلكتي، ثم تنكشف وتجيء الفتنة، فيقول المؤمن: هذه هذه، فمن أحب أن يزحزح عن النار ويدخل الجنة فلتأته منيته وهو يؤمن بالله واليوم الآخر، وليأت إلى الناس الذي يحب أن يؤتى إليه، ومن بايع إماما فأعطاه صفقة يده وثمرة قلبه، فليطعه إن استطاع، فإن جاء آخر ينازعه فاضربوا عنق الآخر.