Sunan an-Nasa'i 3580
سنن النسائي#3580SahihIt 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 and he rode it." 'Ali said: "If we mate a donkey with a horse, we will have one like this." The Messenger of Allah said: "That is only done by those who do not know
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih
Al-AlbaniSahih
Zubair Ali ZaiIsnaad Sahih
In-book reference: 28:20