(27) باب وُجُوبِ النَّفِيرِ وَمَا يَجِبُ مِنَ الْجِهَادِ وَالنِّيَّةِ
Narrated Ibn `Abbas:
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)
Reference: Sahih al-Bukhari 2825
In-book reference: Book 56, Hadith 41
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 4, Book 52, Hadith 79