Sayyiduna Jarir (may Allah be pleased with him) said: The Prophet (peace and blessings be upon him) said: "Any slave who runs away has gone out of the protection (dhimmah)."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب المرتد / 16875
Sayyiduna Jarir (may Allah be pleased with him) said: The Prophet (peace and blessings be upon him) said: "Any slave who turns back to shirk, his blood is lawful."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب المرتد / 16876