Muwatta Malik· موطأ مالك
Muwatta Malik 868
The least thing that is acceptable as a sacrificial animal is a camel or a cow
মুয়াত্তা ইমাম মালিক ৮৬৮ · মুয়াত্তা মালিক•Hajj
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ نَافِعٍ، أَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ، كَانَ يَقُولُ {مَا اسْتَيْسَرَ مِنَ الْهَدْى} بَدَنَةٌ أَوْ بَقَرَةٌ .
Narrator: Yahya
Yahya related to me from Malik from Nafi that Abdullah ibn Urnar used to say, "The least thing that is acceptable as a sacrificial animal is a camel or a cow- Salim al-HilaliMauquf Sahih