وَحَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، عَنْ جَعْفَرِ بْنِ مُحَمَّدٍ، عَنْ أَبِيهِ، عَنْ عَلِيِّ بْنِ أَبِي طَالِبٍ، كَانَ يَقُولُ ‏{‏مَا اسْتَيْسَرَ مِنَ الْهَدْىِ‏}‏ شَاةٌ ‏.‏

Yahya related to me from Malik from Jafar ibn Muhammad from hisfather that Ali ibn Abi Talib used to say, "The least difficult thingacceptable as a sacrificial animal is a sheep." Translation Not Available

Book Ref: Muwatta Imam Malik Book 20 Hadith 869
Web Ref:  Muwatta Imam Malik Book 20 Hadith 167