Sulaiman bin Yasar (may Allah have mercy on him) said: When Malik bin Abdullah Khath'ami was asked about the share of mule-bred horses, he said: "I will not assign a share to a mule-bred horse; the share is only for an Arab horse."
Hadith Referenceسنن سعید بن منصور / كتاب الجهاد / 3954