What is the ruling if a Muslim or *Dhimmi* frees a Muslim slave who subsequently commits apostasy, joins *Dar al-Harb*, and is captured?

Primary text

If a Muslim frees a Muslim, or if a *Dhimmi* frees a Muslim, and that freed person then commits apostasy (*Irtadd*) and joins *Dar al-Harb*, subsequently being captured, it is not permissible to re-enslave him. If he is purchased, the purchase contract is void, and no action is accepted from him except repentance or execution.