Narrated Abu Huraira (Radi-Allahu 'anhu) : Allah's Apostle (Sallallahu 'Alaihi Wa Sallam) said, "(The performance of) 'Umrah is an expiation for the sins committed (between it and the previous one). And the reward of Hajj Mabrur (the one accepted by Allah) is nothing except Paradise." - Bukhari Vol. 3 : No. 1