Sunan an Nasai
2631
Hasan Sahih+2

It was narrated that 'Abdullah said:"The Messenger of Allah said: 'Perform Hajj and 'Umrah consecutively, for they remove poverty and sin as the bellows removes impurity from iron and gold and silver, and Hajj Al-Mabrur brings no less a reward than Paradise

Hasan SahihAbu Ghuddah
Hasan SahihAl-Albani