From Sahih Muslim (Hadith 3291):
Abu Huraira (Allah be pleased with him) reported Allah's Messenger (ﷺ) 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
Reference: Muslim 3291