Sahih Muslim Book 7, Hadith Number 3129.

Chapter : The merit of Hajj and Umra and the day of ‘Arafa (the 9th of Dhu’l-Hijja).

Abu Huraira (Allah be pleased with him) reported Allah’s Messenger (may peace be upon him) as saying. He who came to this House (Ka’ba) (with the intention of performing Pilgrimage), and neither spoke indecently nor did he act wickedly, would return (free from sin) as on the (very first day) his mother bore him.