The Book of Fighting [The Prohibition of Bloodshed]
37/13. Chapter:
The Differences Reported From Abu Ishaq
Sunan an-Nasai
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."
Reference : Sunan an-Nasa'i 4056In-book reference : Book 37, Hadith 91English translation : Vol. 5, Book 37, Hadith 4061