He said, "Messenger of Allah, tell me of a deed that I may hold fast to and act upon."The Messenger of Allah ﷺ said to him, "Hold fast to migration, for there is nothing like it."
أخبرني هارون بن محمد بن بكار بن بلال عن محمد وهو ابن عيسى بن سميع قال حدثنا زيد بن واقد عن كثير بن مرة أن
أنه قال يا رسول الله حدثني بعمل أستقيم عليه وأعمله قال له رسول الله ﷺ عليك بالهجرة فإنه لا مثل لها
[Its chain of transmission is sahih]. Ibn Majah reported it in "Establishment of the Prayers," in the chapter on what has been said about frequent sujud, hadith no. 1422, by another route from Kathir bin Mura, with the same wording, and it is also found in Al-Kubra, hadith no. 7790.