The Prophet ﷺ said, "Performing one Umrah after another is an expiation for the sins committed between them, and an accepted Hajj has no reward except Paradise."
حدثنا أبو مصعب حدثنا مالك بن أنس عن سمي مولى أبي بكر بن عبد الرحمن عن أبي صالح السمان
أن النبي ﷺ قال العمرة إلى العمرة كفارة ما بينهما والحج المبرور ليس له جزاء إلا الجنة
Bukhari narrated it in the book of Umrah, chapter on the obligation of Umrah and its merit, hadith no. 1773, and Muslim in the book of Hajj, chapter on the merit of Hajj and Umrah, hadith no. 1349, from the hadith of Malik through this chain, and it is found in Muwatta (Yahya): 1/346.