'One Umrah expiates the sins until the next Umrah. And the Haj that is accepted by Allah and performed properly has no reward other than paradise. - Sahih Bukhari.
The Prophet (SAW) Said 'An Umrah during the month of Ramzan is equivalent to a Haj, Tirimidhi, Ibnu Majah.
Prophet (Saw) said : Perform Haj and Umrah frequently. For those two remove your sins as the blacksmith removes the rust from the iron Nasahi.