Sahih al-Bukhari 2825
Sahih al-Bukhari · Book 56: Fighting for the Cause of Allah (Jihaad) · The obligation of going out for Jihad
Narrated Ibn `Abbas:
حَدَّثَنَا عَمْرُو بْنُ عَلِيٍّ ، حَدَّثَنَا يَحْيَى ، حَدَّثَنَا سُفْيَانُ ، قَالَ حَدَّثَنِي مَنْصُورٌ ، عَنْ مُجَاهِدٍ ، عَنْ طَاوُسٍ ، عَنِ ابْنِ عَبَّاسٍ ـ رضى الله عنهما ـ أَنَّ النَّبِيَّ صلى الله عليه وسلم قَالَ يَوْمَ الْفَتْحِ " لاَ هِجْرَةَ بَعْدَ الْفَتْحِ وَلَكِنْ جِهَادٌ وَنِيَّةٌ، وَإِذَا اسْتُنْفِرْتُمْ فَانْفِرُوا " .
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)