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• Which kind of slaves are allowed: we know that only prisoners of war can be taken as slaves ^{(note even in this case there are details: for example instead of enslavement the ruler could ask for ransom, or free them if this would be a benefit for Muslims and yes also killing could be an option)} and here we also know if they declare "Islam" they won't be taken as slaves. And the Muslims at least could choose to free their prisoners of war etc.! An other possibility is to be born as a child of slaves in a Muslims household.
• Islam doesn't allow a Muslim to enslave a Muslim: Muslims can't in any case make a Muslim or (at least) one of the people of the book who live beside them a slave! But in medieval Europe a defaulter or debtor etc. could be made slave for his obligee/creditor! And prisoners of war no matter if they where Christians or Jews or anything else could be made slaves!
• Rules how to treat a slave!
• The rights of a slave: For example one can't force a slave to do something bad or a sin:

This Verse also shows that one could (is encouraged to) write a contract to free a slave or make contracts with slaves.

About the revealing of the last part of the verse It's narrated that a slave-girl (which according some narration has converted to Islam) was forced to do zina (after her conversion) and before coming to Medina she was used to do so.

• We also have rules about relationships (intercourse/marriage) to female slaves (See for example: Shouldn't a slave woman guard her private parts except from her spouse?):
• a Muslim master could have intercourse with a female slave (he owns) under some conditions (For example a slave woman could reject her master for reasons like illness etc.!), but a Muslim woman is prohibited to have intercourse with a male slave.
• A Muslim man could marry a female slave owned by an other Muslim man.
• Apparently female slaves which are kufar, worship idols or polytheists are haram for this purpose, but there are opinions allowing it, for example ibn 'Abd al-Barr said that the hadiths (like this one) which show that Muslims had intercourse with pagan captives have been made void by verse 2:221

• Which kind of slaves are allowed: we know that only prisoners of war can be taken as slaves (note even in this case there are details: for example instead of enslavement the ruler could ask for ransom, or free them if this would be a benefit for Muslims and yes also killing could be an option) and here we also know if they declare "Islam" they won't be taken as slaves. And the Muslims at least could choose to free their prisoners of war, etc! An other possibility is to be born as a child of slaves in a Muslims household.
• Islam doesn't allow a Muslim to enslave a Muslim: Muslims can't in any case make a Muslim or (at least) one of the people of the book who live beside them a slave! But in medieval Europe a defaulter or debtor etc. could be made slave for his obligee/creditor! And prisoners of war no matter if they where Christians or Jews or anything else could be made slaves!
• Rules how to treat a slave!
• The rights of a slave: For example one can't force a slave to do something bad or a sin:

This verse also shows that one could (is encouraged to) write a contract to free a slave or make contracts with slaves.

About the revealing of the last part of the verse it's narrated that a slave-girl (which according some narration has converted to Islam) was forced to do zina (after her conversion) and before coming to Medina she was used to do so.

• We also have rules about relationships (intercourse/marriage) to female slaves (See for example: Shouldn't a slave woman guard her private parts except from her spouse?):
• a Muslim master could have intercourse with a female slave (he owns) under some conditions (for example a slave woman could reject her master for reasons like illness, etc.), but a Muslim woman is prohibited to have intercourse with a male slave.
• A Muslim man could marry a female slave owned by an other Muslim man.
• Apparently female slaves which are kufar, worship idols or polytheists are haram for this purpose, but there are opinions allowing it, for example ibn 'Abd al-Barr said that the hadiths (like this one) which show that Muslims had intercourse with pagan captives have been made void by verse 2:221

see also in sahih al-Bukahri and Muslim.

see also in sahih al-Bukahri and Muslim.

• Which kind of slaves are allowed: we know that only prisoners of war can be taken as slaves ^{(note even in this case there are details: for example instead of enslavement the ruler could ask for ransom, or free them if this would be a benefit for Muslims and yes also killing could be an option)} and here we also know if they declare "Islam" they won't be taken as slaves. And the Muslims at least could choose to free their prisoners of war etc.! An other possibility is to be born as a child of slaves in a Muslims household.
• Islam doesn't allow a Muslim to have Muslim salves, Muslims can't in any case make a Muslim or (at least) one of the people of the book who live beside them a slave! But in medieval Europe a defaulter or debtor etc. could be made slave for his obligee/creditor! And prisoners of war no matter if they where Christians or Jews or anything else could be made slaves!
• Rules how to treat a slave!
• The rights of a slave: For example one can't force a slave to do something bad or a sin:

• Many expiations for sins where one could choose or has to free a slave.
• Islam encouraged to free slaves:

• We also have rules about relationships (intercourse/marriage) to female slaves (See for example: Shouldn't a slave woman guard her private parts except from her spouse?):
• a Muslim master could have intercourse with a female slave (he owns) under some conditions (For example a slave woman could reject her master for reasons like illness etc.!), but a Muslim woman is prohibited to have intercourse with a male slave.
• A Muslim man could marry a female slave owned by an other Muslim man.
• Apparently female slaves which are kufar, worship idols or polytheists are haram, but there are opinions allowing it, for example ibn 'Abd al-Barr said that the hadiths (like this one) which show that Muslims had intercourse with pagan captives have been made void by verse 2:221

• Which kind of slaves are allowed: we know that only prisoners of war can be taken as slaves ^{(note even in this case there are details: for example instead of enslavement the ruler could ask for ransom, or free them if this would be a benefit for Muslims and yes also killing could be an option)} and here we also know if they declare "Islam" they won't be taken as slaves. And the Muslims at least could choose to free their prisoners of war etc.! An other possibility is to be born as a child of slaves in a Muslims household.
• Islam doesn't allow a Muslim to enslave a Muslim: Muslims can't in any case make a Muslim or (at least) one of the people of the book who live beside them a slave! But in medieval Europe a defaulter or debtor etc. could be made slave for his obligee/creditor! And prisoners of war no matter if they where Christians or Jews or anything else could be made slaves!
• Rules how to treat a slave!
• The rights of a slave: For example one can't force a slave to do something bad or a sin:

• Many expiation for sins where one could choose or has to free a slave.
• Islam encouraged to free slaves:

• We also have rules about relationships (intercourse/marriage) to female slaves (See for example: Shouldn't a slave woman guard her private parts except from her spouse?):
• a Muslim master could have intercourse with a female slave (he owns) under some conditions (For example a slave woman could reject her master for reasons like illness etc.!), but a Muslim woman is prohibited to have intercourse with a male slave.
• A Muslim man could marry a female slave owned by an other Muslim man.
• Apparently female slaves which are kufar, worship idols or polytheists are haram for this purpose, but there are opinions allowing it, for example ibn 'Abd al-Barr said that the hadiths (like this one) which show that Muslims had intercourse with pagan captives have been made void by verse 2:221