‘Imran b. Husain said

Thaqif were allies of the B. ‘Uqail, so when Thaqif took two of Allah's Messenger ﷺ’s companions prisoner, his companions took prisoner a man of the B. ‘Uqail, bound him and threw him out on the lava plain. Allah's Messenger ﷺ passed him and he called to him, “Muhammad, Muhammad, for what have I been taken?” He replied, “For the crime of your allies Thaqif.” He then left him and passed on, but when he cried, “Muhammad, Muhammad,” Allah's Messenger ﷺ took pity on him and returned and asked him about himself. When he told him he was a Muslim he said, “If you had said it when you were your own master you would have been completely successful.”* Then Allah's Messenger ﷺ ransomed him for the two men Thaqif had taken prisoner. *This means that not only would he go to paradise in the next life, but he would have been saved the experience of being taken a captive in this. Muslim transmitted it.