From Sahih Muslim (Hadith 4829):
It has been narrated on the authority of Ibn 'Abbas that the Messenger of Allah (ﷺ) said on the day of the Conquest of Mecca:There is no Hijra now, but (only) Jihad (fighting for the cause of Islam) and sincerity of purpose (have great reward) ; when you are asked to set out (on an expedition undertaken for the cause of Islam) you should (readily) do so
Reference: Muslim 4829