Sunan Ibn Majah
1730
Sahih+3

It was narrated from Abu Qatadah that the Messenger of Allah (ﷺ) said:“Fasting on the Day of ‘Arafah, I hope from Allah, expiates for the sins of the year before and the year after.”

SahihAl-Albani
SahihMuhammad Fouad Abd al-Baqi