Sunan an-Nasa'i 4169
سنن النسائي#4169SahihIt was narrated that Safwan bin Umayyah said:"I said: 'O Messenger of Allah, they are saying that no one will enter Paradise except a Muhajir."' He said: "There is no more emigration (Hijrah) after the Conquest of Makkah, rather there is Jihad and intention. When you are called to moblize (for Jihad) then do so
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih
Al-AlbaniSahih
Zubair Ali ZaiSahih
In-book reference: 39:21