Musnad Abu Ya'la al-Mawsili 161:9

'Abd al-A'la ibn Hammad al-Narsi narrated to us, from Malik, from Sumayy, from Abu Salih, from Abu Hurayrah, that the Prophet (peace and blessings of Allah be upon him) said: "The 'Umrah to the 'Umrah is an expiation for what is between them, and the accepted Hajj has no reward other than Paradise."