وَعَنْ عَبْدِ اَللَّهِ بْنِ اَلسَّعْدِيِّ رضى الله عنه
قَالَ: قَالَ رَسُولُ اَللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ -«لَا تَنْقَطِعُ اَلْهِجْرَةُ مَا قُوتِلَ اَلْعَدُوُّ»
“Emigration (to fight the enemy) will continue as long as an enemy is fought.” Related by An-Nasai, and Ibn Hibban graded it as Sahih.