Harmala reported,

Amr said, "I saw Harmala."He said, Usama sent me to Ali and told me, "He will ask you now and say, 'What did your companion leave behind?' Say to him, 'He says to you, Even if you were in the jaws of a lion, I would love to be with you in it, but this is a matter I did not see clearly.'"So he gave me nothing. Then I went to Hasan, Husayn, and Ibn Jafar, and they loaded up my mount for me.

Bukhari 7110

Sahih

حدثنا علي بن عبد الله حدثنا سفيان قال قال عمرو أخبرني محمد بن علي أن

حرملة مولى أسامة أخبره

قال عمرو قد رأيت حرملة قال أرسلني أسامة إلى علي وقال إنه سيسألك الآن فيقول ما خلف صاحبك فقل له يقول لك لو كنت في شدق الأسد لأحببت أن أكون معك فيه ولكن هذا أمر لم أره فلم يعطني شيئا فذهبت إلى حسن وحسين وابن جعفر فأوقروا لي راحلتي

البخاري 7110صحيح
Contents
Reference
Commentary
Ayat
Collection
Sahih Bukhari
Book
Tribulations
Chapter
Prophet's ﷺ saying about Hasan bin Ali, "This son of mine is a chief, and perhaps Allah will reconcile through him two factions of Muslims"
Numbering
Darussalam 7110
Bukhari 7110