From Sahih Bukhari (Hadith 2611):
Narrated Ibn 'Umar (ra):We were in the company of the Prophet (ﷺ) on a journey, and I was riding a troublesome camel. The Prophet (ﷺ) asked 'Umar to sell that camel to him. So, 'Umar sold it to him. The Prophet (ﷺ) then said, "O 'Abdullah! The camel is for you
Reference: Bukhari 2611