Abu Hurairah (May Allah be pleased with him) reported:
The Messenger of Allah sallallahu alayhi wasallam said,
"(The performance of) `Umrah is an expiation for the sins committed
between it and the previous `Umrah; and the reward of Hajj Mabrur
(i.e., one accepted) is nothing but Jannah.''
[Al-Bukhari and Muslim].