Musnad Ahmad 30:2189

Muhammad ibn Ja'far narrated to us, he said: Shu'bah narrated to us, from Sayyar, from Abu Hazim, from Abu Hurairah, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Whoever performs Hajj to this House, and does not commit obscenity (rafath), and does not commit wickedness (fusuq), will return as he was on the day his mother gave birth to him."