Amr reported,

There was a man here named Nawwas who had thirsty camels suffering from a chronic illness. Ibn Umar went and bought those camels from his business partner. The partner came to him and asked, "To whom did you sell those camels?"He replied, "To an old man of such-and-such description."The partner exclaimed, "Woe to you! By Allah, that was Ibn Umar."So he went to Ibn Umar and said, "My partner sold you diseased camels without you recognizing what they were."Ibn Umar said, "Then take them back."When the man went to drive them away, Ibn Umar said, "Leave them. We are content with the ruling of the Messenger of Allah ﷺ, there is no contagion."Sufyan heard this from Amr.

حدثنا علي بن عبد الله حدثنا سفيان قال

قال عمرو

كان ها هنا رجل اسمه نواس وكانت عنده إبل هيم فذهب ابن عمر رضي الله عنهما فاشترى تلك الإبل من شريك له فجاء إليه شريكه فقال بعنا تلك الإبل فقال ممن بعتها قال من شيخ كذا وكذا فقال ويحك ذاك والله ابن عمر فجاءه فقال إن شريكي باعك إبلا هيما ولم يعرفك قال فاستقها قال فلما ذهب يستاقها فقال دعها رضينا بقضاء رسول الله ﷺ لا عدوى سمع سفيان عمرا