A hadith like this has been narrated on the authority of 'Ubaidullah b. Abi Yazid.
Sahih Muslim Book 13, Hadith 169
← Previous Hadith I do not know Allah's Messenger (ﷺ) singling out any day's fast and considering it more excellent than another, except this day (the day of Ashura) and this month, meaning the month of Ramadan.

Sahih Muslim Book 13, Hadith 168 Next Hadith → I went to Ibn 'Abbas (Allah be Pleased with both of them) and he was reclining using his mantle as a pillow near the fountain of Zamzam. I said to him: Tell me about fasting on Ashura. He said: When you see the new moon of Muharram then count the (days) and observe fast on the 9th. I said to him: Is it how the Messenger of Allah (ﷺ) observed the fast? He said: Yes.

Sahih Muslim Book 13, Hadith 170