Sayyiduna Ibn Abbas (may Allah be pleased with them both) said that the Messenger of Allah (peace and blessings be upon him) said: "Perform Hajj and Umrah one after the other, for they both remove poverty and sins just as the bellows removes the impurity of iron."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 11380