'Abdullah bin 'Ubaidullah bin 'Abbas said:
"We were sitting with 'Abdullah bin 'Abbas and he said: 'By Allah, the Messenger of Allah (ﷺ) did not say specifically anything for us above the people, except for three things: He commanded us to do Wudu' properly, [2] not to consume charity, and not to mate donkeys with horses.'"[1] Isbagh Al-Wudu'[2] An Nusbig Al-Wudu'
English reference: Vol. 1, Book 1, Hadith 141
Arabic reference: Book 1, Hadith 142