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 Umarbought a female riding-camel for four camels and he guaranteed to givethem in full to the buyer at ar-Rabadha. Translation Not Available

Book Ref: Muwatta Imam Malik Book 31 Hadith 1352
Web Ref:  Muwatta Imam Malik Book 31 Hadith 60