Musnad Ahmad 30:2188

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