Musnad Abu Ya'la al-Mawsili 151:10

Abu Bakr ibn Abi Shaybah narrated to us, Abu Khalid al-Ahmar narrated to us, from ‘Amr ibn Qays, from ‘Asim, from Shaqiq, from ‘Abdullah, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Perform Hajj and ‘Umrah consecutively, for they both remove poverty and sins just as the bellows remove the dross of iron, gold, and silver. And there is no reward for an accepted Hajj except Paradise."