(1) باب وُجُوبِ الْعُمْرَةِ وَفَضْلِهَا
Narrated Abu Huraira:
Allah's Messenger (ﷺ) said, "(The performance of) `Umra 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."
Reference: Sahih al-Bukhari 1773
In-book reference: Book 26, Hadith 1
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 3, Book 27, Hadith 1