كتاب الحج
10  
The Book of Hajj
(233)
Chapter: The Obligation of Hajj (Pilgrimage) and its Excellence
(233)
- باب وجوب الحج وفضله
Riyad as-Salihin 1275
Abu Hurairah (May Allah be pleased with him) reported:
The Messenger of Allah (ﷺ) 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].

وعنه أن رسول الله صلى الله عليه وسلم قال‏:‏ ‏ "‏العمرة إلى العمرة كفارة لما بينهما، والحج المبرور ليس له جزاء إلا الجنة‏"‏ ‏(‏‏(‏متفق عليه‏)‏‏)‏
Reference : Riyad as-Salihin 1275
In-book reference : Book 10, Hadith 5