The Messenger of Allah ﷺ said, "Follow up Hajj with Umrah, for the two of them remove poverty and sins just as the bellows removes the impurities from iron, gold, and silver. There is no reward for an accepted Hajj except Paradise."
قال رسول الله ﷺ: تابعوا بين الحج والعمرة، فإنهما ينفيان الفقر والذنوب كما ينفي الكير خبث الحديد والذهب والفضة، وليس للحجة المبرورة ثواب إلا الجنة.
Tirmidhi (810) and Nasai (2631) both narrated it from the hadith of Abu Khalid Ahmar, from Amr bin Qays, from Asim, from Shaqiq, from Abdullah bin Masud, and he mentioned it. Its chain is hasan because of Asim, who is Ibn Abu Najud, for he is one whose hadith is hasan. Imam Ahmad (3669), Ibn Khuzayma (2512), and Ibn Hibban (3693) all narrated it through this same route.Tirmidhi said, "Hasan sahih gharib from the hadith of Ibn Masud."