“I used to sell camels, and I used to buy gold for silver and silver for gold, Dinar for Dirham and Dirham for Dinar. I asked the Prophet (ﷺ) about that, and he said: ‘If you take one of them and give the other, then you and your companion should not separate until everything is clear (i.e., the exchange is completed).’” (Hasan) Another chain with similar wording.
“I shall reach the Cistern (Haud) before you, and I will boast of your great numbers before the nations, so do not fight one another after I am gone.’”
“We were sitting with ‘Umar and he said: ‘Which of you has remembered a Hadith from the Messenger of Allah (ﷺ) concerning Fitnah?’” Hudhaifah said: “I said: ‘I have.’ He said: ‘You are very bold.’ He said: ‘How?’ He said: ‘I heard him say: “The fitnah of a man with regard to his family, his children and his neigbors are expiated by his prayers, fasts, charity and enjoining what is good and forbidding what is evil.” ‘Umar said: ‘This is not what I meant, rather I meant that which moves like the waves of the sea.’” Hudhaifah said: “Don’t worry about it, O Commander of the Believers! For there is a closed door between you and them.” ‘Umar said: “Will that door be broken or opened?” I said: “No, it will be broken.” ‘Umar said: “Then it will never be closed.’” We asked Hudhaifah: “Did ‘Umar know what that door meant?” He said: “Yes, just as he knows that there will be night before morning, because I narrated to him a Hadith in which there are no errors.” We were afraid to ask him who the door was, so we said to Masruq: “Ask him.” He said: “‘Umar.”