It was narrated that ‘Ali bin Abi Talib, may Allah be pleased with him, said: “A mule was given as a gift to the Messenger of Allah صلی اللہ علیہ وآلہ وسلم and he rode it.” ‘Ali said: “If we mate a donkey with a horse, we will have one like this.” The Messenger of Allah صلی اللہ علیہ وآلہ وسلم said: “That is only done by those who do not know.”(Sahih)