Sura 2 is the longest Sura in Mohammed's totalitarian charter named the Koran or 'Recital'. Recite, memorize, obey.  Good Moslems need to accept the existence of being a 'slave', a slave to the Al-Lah (celestial or moon deity of Mecca) and of course Muhammad himself, the only spokesman for the Al Lah and the last of the prophets.

How liberating.  Or not.

A religion by definition frees the mind, the body, the spirit and invokes rationality in the construction of social and ethical programs.

Not so with the Koran.  Just shut up and follow the great man Muhammad.  Free-will?  That would be tainted with the ideas of white privilege.  Dispense with that civilizational racism already.  All cultures are relative.  Protagoras and the pre-Socratic sophist philosophers said so.

The use of the nouns, slave or slaves, runs throughout the width and breadth of the Koran.  There are about 420 pages in the Koran.  The plural 'slaves' appears on 226 of them and 'slave' singular, is cited on 109 pages.  Together 'slave' and 'slaves' are found in 335 pages or about 80% of the Koran.  At the verse level these terms comprise 5% of the verses out the Koranic total of 6236.  It does appear that this Al-Lah thing, idol, Hub'al, Muhammad, is rather preoccupied with slavery.  

Witness the ravings in Sura 2 about slaves usually married with violence against the hated Unbelievers:

002:090 URL  How bad is that for which they have sold their ownselves, that they should disbelieve in that which Allah has revealed (the Qur'an), grudging that Allah should reveal of His Grace unto whom He will of His slaves.  So they have drawn on themselves wrath upon wrath. And for the disbelievers, there is disgracing torment.

All humans are just slaves of Al Lah.  Those who disbelieve or who commit ‘shirk’ namely a less than enthusiastic piety or outright ‘rebellion’ against the Al Lah are doomed to hell. 

002:186 URL   And when My slaves ask you (O Muhammad SAW) concerning Me, then (answer them), I am indeed near (to them by My Knowledge). I respond to the invocations of the supplicant when he calls on Me (without any mediator or intercessor). So let them obey Me and believe in Me, so that they may be led aright.

002:207URL  And of mankind is he who would sell himself, seeking the Pleasure of Allah. And Allah is full of Kindness to (His) slaves.

Muhammad is referenced as the penultimate slave of course with the usual and rather idiotic refrain 'peace be upon him', whenever his hallowed name is invoked.  This for a man who slaughtered, butchered, murdered, slave-traded, erected so to speak a large personal harem, and died fat and covered in gold, poisoned, or strangled [or both] by his own men.  

For the Al Lah, Muhammad is the slave prima inter pares.

002:023 URL    And if you (Arab pagans, Jews, and Christians) are in doubt concerning that which We have sent down (i.e. the Qur'an) to Our slave (Muhammad Peace be upon him), then produce a Surah (chapter) of the like thereof and call your witnesses (supporters and helpers) besides Allah, if you are truthful.

The above Sura is interesting.  The Jews, Christians and other pagans living in Arabia, knew that Muhammad was a fraud.  The endless miracles of Christ were still fresh in the cultural memory.  Show us a miracle of healing or resurrection would be the cry against Muhammad.  The Al Lah responds through Muhammad that the Koran itself is the greatest of all miracles.  It is a weak and disconsolate rejoinder. 

2:221 states a Muslim slave is superior to a non-Muslim.  Being a beaten, subjected and debased human who is purportedly Muhammadan is superior to a free-thinking, independent non-Muslim.

002:221 URL    And do not marry Al-Mushrikat (idolatresses, etc.) till they believe (worship Allah Alone). And indeed a slave woman who believes is better than a (free) Mushrikah (idolatress, etc.), even though she pleases you. And give not (your daughters) in marriage to Al-Mushrikun till they believe (in Allah Alone) and verily, a believing slave is better than a (free) Mushrik (idolater, etc.), even though he pleases you. Those (Al-Mushrikun) invite you to the Fire, but Allah invites (you) to Paradise and Forgiveness by His Leave, and makes His Ayat (proofs, evidences, verses, lessons, signs, revelations, etc.) clear to mankind that they may remember.

In a similar vein in 2:177 we see a reference to freeing slaves – as long as they join the cult of course.  One of Muhammad's first converts was his personal black slave. Islam is famously racist, with those entering hell possessing 'black faces' and Kaffir originally designating a black slave – one of the lowliest life forms in the Moslem hierarchy. Free your slaves to join the cult of Al-Lah, and your 'Lord' will be pleased, as long as you know that you must fight for him or it:

002:177 URL    It is not Al-Birr (piety, righteousness, and each and every act of obedience to Allah, etc.) that you turn your faces towards east and (or) west (in prayers); but Al-Birr is (the quality of) the one who believes in Allah, the Last Day, the Angels, the Book, the Prophets and gives his wealth, in spite of love for it, to the kinsfolk, to the orphans, and to Al-Masakin (the poor), and to the wayfarer, and to those who ask, and to set slaves free, performs As-Salat (Iqamat-as-Salat), and gives the Zakat, and who fulfill their covenant when they make it, and who are As-Sabirin (the patient ones, etc.) in extreme poverty and ailment (disease) and at the time of fighting (during the battles). Such are the people of the truth and they are Al-Muttaqun (pious - see V.2:2).

So, slavery is the new freedom in the Koran.  Free yourself by submitting to Al-Lah and Muhammad!  Then all the blessings of the Meccan moon deity will be bestowed upon your person in the male-Moslem heaven, with eternal delights to occupy your time. The Koran has nothing to say about what female Moslem 'slaves' will get from the Al-Lah thing.

In Moslem jurisprudence the Koranic 'legal' ideal of an eye for an eye, is usually followed and believed by the more pious.  If you commit a crime against a Moslem's slave than he has a right to commit a similar action against your slave.  This 'Law of equality in punishment' is a pre-iron age code, which historically can be traced far beyond the Babylonian times of 1700 B.C.  It is crude and not a program of jurisprudence but one of simplistic reciprocation.  Today of course the relativists accept this rather banal code as an alternative form of 'justice' embedded in the various implementation of Sharia or Koranic 'law'.

002:178 URL    O you who believe! Al-Qisas (the Law of Equality in punishment) is prescribed for you in case of murder: the free for the free, the slave for the slave, and the female for the female. But if the killer is forgiven by the brother (or the relatives, etc.) of the killed against blood money, then adhering to it with fairness and payment of the blood money, to the heir should be made in fairness. This is an alleviation and a mercy from your Lord. So after this whoever transgresses the limits (i.e. kills the killer after taking the blood money), he shall have a painful torment.

Slavery was and is rife within Islam. The Islamic irruptions were in large measure the attack on sophisticated civilizations by barbarous desert peoples seeking wealth, booty, women and manufactured products.  Slavery is accepted as a de-facto part of existence within Islam.  Sex enslavement of white women, millions of whom were taken over 1400 years to populate harems and households were a driving factor in the Musulman Jihad.  It is rather curious then, that a cult focused on pre-modern slavery and its attendant immorality, is deemed to be a religion.  

For the record Muslims and Blacks still own millions of slaves today in East and Central Africa.