Sahih Muslim 715pBook 22, Hadith 140
We went from Mecca to Medina with Allah's Messenger (ﷺ) when my camel fell ill, and the rest of the hadith is the same. (But it in also narrated in it: ) He (the Holy Prophet) said to me: Sell your camel to me. I said: No, but it is yours. He said: No. (it can't be), but sell it to me. I said: No, but, Allah's Messenger, it is yours. He said: No, it can't be, but sell it to me. I said: Then give me an 'uqaya of gold for I owe that to a person and then it would be yours. He (the Holy Prophet) said: I take it (for an 'uqiya of gold) and you reach Medina on it. As I reached Medina, Allah's Messenger (ﷺ) said to Bilal: Give him an 'uqiya of gold and make some extra payment too. He (Jabir) said: He gave me an 'uqiya of gold and made an addition of a qirat. He (Jabir) said: The addition made by Allah's Messenger (ﷺ) was with me (as a sacred trust for belssing) and lay with me in a pocket until the people of Syria took it on the Day of Harra.