that the Messenger of Allah (Sallallaahu 'alaihi wasallam) said:
the fasting on the day of 'Arafa (9th of Dhu'I-Hijja) expiates the sins of the preceding year and the coming year.
[Sahih Muslim - Book #06 - Hadith #2603]
Please Share this Hadith with your relatives & friends and may Allah SWT reward you.