Hadith.3539 - Ghiyath ibn Ibrahim al-Darimi narrated from Imam Jafar ibn Muhammad Al-Sadiq عليه السلام from his father, Imam Muhammad ibn Ali Al-Baqir عليه السلام:
Imam Ali ibn Abi Talib عليه السلام said regarding the reward for capturing a runaway slave:
"Indeed, the Muslim should be returned to the Muslim."