Qays bin Abbad reported,

We were with Ali , and whenever he came upon a notable place, climbed a hill, or descended into a valley, he would say, "Glory be to Allah. Allah and His Messenger spoke the truth."So I said to a man from Banu Yashkur, "Let us go to the Commander of the Faithful and ask him about his saying, 'Allah and His Messenger spoke the truth.'"We went to him and said, "Commander of the Faithful, we have noticed that whenever you come upon a notable place, descend into a valley, or climb a hill, you say, 'Allah and His Messenger spoke the truth.' Did the Messenger of Allah entrust something to you concerning this?"He turned away from us, but we pressed him. When he saw our persistence, he said, "By Allah, the Messenger of Allah ﷺ did not entrust anything to me privately beyond what he entrusted to people in general. But people fell upon Uthman and killed him, and others were in a worse state and acted worse in that matter than I did. Then I came to see that I was the most deserving of this affair, so I rose up to take it. Allah knows whether we were right or wrong."

حدثنا عبد الرزاق أنبأنا معمر عن علي بن زيد عن الحسن

عن قيس بن عباد قال

كنا مع علي رضي الله عنه فكان إذا شهد مشهدا أو أشرف على أكمة أو هبط واديا قال سبحان الله صدق الله ورسوله فقلت لرجل من بني يشكر انطلق بنا إلى أمير المؤمنين حتى نسأله عن قوله صدق الله ورسوله قال فانطلقنا إليه فقلنا يا أمير المؤمنين رأيناك إذا شهدت مشهدا أو هبطت واديا أو أشرفت على أكمة قلت صدق الله ورسوله فهل عهد رسول الله إليك شيئا في ذلك قال فأعرض عنا وألححنا عليه فلما رأى ذلك قال والله ما عهد إلي رسول الله ﷺ عهدا إلا شيئا عهده إلى الناس ولكن الناس وقعوا على عثمان رضي الله عنه فقتلوه فكان غيري فيه أسوأ حالا وفعلا مني ثم إني رأيت أني أحقهم بهذا الأمر فوثبت عليه فالله أعلم أصبنا أم أخطأنا