The Messenger of Allah ﷺ said, "Follow up Hajj with Umra, for they wipe out poverty and sins just as the bellows removes the impurities from iron, gold, and silver. And the accepted Hajj has no reward less than Paradise."
أخبرنا محمد بن يحيى بن أيوب قال حدثنا سليمان بن حيان أبو خالد عن عمرو بن قيس عن عاصم عن شقيق
قال رسول الله ﷺ تابعوا بين الحج والعمرة فإنهما ينفيان الفقر والذنوب كما ينفي الكير خبث الحديد والذهب والفضة وليس للحج المبرور ثواب دون الجنة
Its isnad is hasan. Ahmad (1/387) narrated it from Sulayman bin Hayan Abu Khalid Ahmar with this chain, explicitly stating that he heard it directly. Tirmidhi narrated it through his route, in the book of Hajj, chapter on what has been mentioned regarding the reward of Hajj and Umrah, hadith 810, and the hadith is in Kubra, hadith 3610. Ibn Khuzayma graded it sahih, hadith 2512, as did Ibn Hibban, hadith 967. Tirmidhi said, "hasan sahih gharib."