Imam Malik (may Allah have mercy on him) said: The hubs (withholding) that Muhammad (peace and blessings be upon him) came to abolish is the one that is in the Book of Allah: "Allah has not appointed any bahirah (a she-camel whose ear was slit), nor sa'ibah (an animal let loose when it grew old), nor wasilah (a female that bore young in succession), nor ham (a stallion camel which, on reaching a particular state, was neither ridden nor loaded)." [Surah al-Ma'idah: 103] Imam Malik (may Allah have mercy on him) discussed this with Imam Abu Yusuf (may Allah have mercy on him) in the presence of the Commander of the Believers.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الوقف / 11911