"The Messenger of Allah [SAW] said: 'If a slave runs away to the land of Shirk, it becomes permissible to shed his blood.'" (Using translation from Nasāʾī 4052)
قَالَ رَسُولُ اللهِ ﷺ «إِذَا أَبَقَ الْعَبْدُ إِلَى أَرْضِ الشِّرْكِ فَقَدْ حَلَّ دَمُهُ»