سُنَنُ النَّسَائِيِّ
Sunan an-Nasa’i 4056
The Book of Fighting [The Prohibition of Bloodshed]
The Differences Reported From Abu Ishaq
أَخْبَرَنَا عَلِيُّ بْنُ حُجْرٍ، قَالَ حَدَّثَنَا شَرِيكٌ، عَنْ أَبِي إِسْحَاقَ، عَنْ عَامِرٍ، عَنْ جَرِيرٍ، قَالَ أَيُّمَا عَبْدٍ أَبَقَ مِنْ مَوَالِيهِ وَلَحِقَ بِالْعَدُوِّ فَقَدْ أَحَلَّ بِنَفْسِهِ .
It was narrated that Jarir said: "Any slave who runs away from his masters and joins the enemy, he has made it permissible to shed his blood."
Sunan an-Nasa'i, 4056Sahih (Darussalam)