Muwatta Malik #1408
Business Transactions
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ نَافِعٍ، أَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ، اشْتَرَى رَاحِلَةً بِأَرْبَعَةِ أَبْعِرَةٍ مَضْمُونَةٍ عَلَيْهِ يُوفِيهَا صَاحِبَهَا بِالرَّبَذَةِ .
Yahya related to me from Malik from Nafi that Abdullah ibn Umar
bought a female riding-camel for four camels and he guaranteed to give
them in full to the buyer at ar-Rabadha.
About Muwatta Malik
This hadith is #1408 from Muwatta Malik, in the Book of Business Transactions.