On the day of the Conquest (of Mecca) the Prophet (ﷺ) said, "There is no emigration after the Conquest but Jihad and intentions. When you are called (by the Muslim ruler) for fighting, go forth immediately." (See Hadith No. 42)
Sahih al-Bukhari Book 56, Hadith 41
← Previous Hadith I was in the company of Talha bin 'Ubaidullah, Sa`d, Al-Miqdad bin Al-Aswad and `Abdur Rahman bin `Auf and I heard none of them narrating anything from Allah's Messenger (ﷺ) but Talha was talking about the day (of the battle) of Uhud.

Sahih al-Bukhari Book 56, Hadith 40 Next Hadith → Allah's Messenger (ﷺ) said, "Allah welcomes two men with a smile; one of whom kills the other and both of them enter Paradise. One fights in Allah's Cause and gets killed. Later on Allah forgives the 'killer who also get martyred (In Allah's Cause)."

Sahih al-Bukhari Book 56, Hadith 42