When the slave runs away from his master, his prayer is not accepted. (Using translation from Muslim 70)
عَنِ النَّبِيِّ ﷺ قَالَ «إِذَا أَبَقَ الْعَبْدُ لَمْ تُقْبَلْ لَهُ صَلَاةٌ وَإِنْ مَاتَ مَاتَ كَافِرًا» فَأَبَقَ غُلَامٌ لِجَرِيرٍ فَأَخَذَهُ فَضَرَبَ عُنُقَهُ قَالَ أَبُو الْقَاسِمِ «مَعْنَاهُ أَنَّهُ كَفَرَ وَلَحِقَ بِدَارِ الْحَرْبِ»
"If a slave runs away, no Salah will be accepted from him, and if he dies he will die a disbeliever." A slave of Jarir's ran away, and he caught him and struck his neck (killing him).
عَنِ النَّبِيِّ ﷺ إِذَا أَبَقَ الْعَبْدُ لَمْ تُقْبَلْ لَهُ صَلاَةٌ وَإِنْ مَاتَ مَاتَ كَافِرًا وَأَبَقَ غُلاَمٌ لِجَرِيرٍ فَأَخَذَهُ فَضَرَبَ عُنُقَهُ
"If a slave runs away, no Salah will be accepted from him, and if he dies he will die a disbeliever." A slave of Jarir's ran away, and he caught him and struck his neck (killing him). (Using translation from Nasāʾī 4050)
عَنِ النَّبِيِّ ﷺ «إِذَا أَبَقَ الْعَبْدُ لَمْ تُقْبَلْ لَهُ صَلَاةٌ وَإِنْ مَاتَ مَاتَ كَافِرًا» وَأَبَقَ غُلَامٌ لِجَرِيرٍ فَأَخَذَهُ فَضَرَبَ عُنُقَهُ