Abu Qatada al-Ansari (Radhi-Allah-hu ‘anhu) reported:
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]
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