GodlyVerses

" And women already married, except those whom your right hands possess (iv. 24)" (i. e. they were lawful for them when their 'Idda period came to an end). - Hadith Muslim 1456a (islam)
Book 17, Hadith 41
Book 8, Hadith 3432

[10]When thou goest forth to war against thine enemies, and the LORD thy God hath delivered them into thine hands, and thou hast taken them captive,
[11]And seest among the captives a beautiful woman, and hast a desire unto her, that thou wouldest have her to thy wife;
[12]Then thou shalt bring her home to thine house; and she shall shave her head, and pare her nails;
[13]And she shall put the raiment of her captivity from off her, and shall remain in thine house, and bewail her father and her mother a full month: and after that thou shalt go in unto her, and be her husband, and she shall be thy wife. - Bible Deuteronomy 21:10-13 (bible torah)

[9]And the children of Israel took all the women of Midian captives, and their little ones, and took the spoil of all their cattle, and all their flocks, and all their goods.
[10]And they burnt all their cities wherein they dwelt, and all their goodly castles, with fire.
[11]And they took all the spoil, and all the prey, both of men and of beasts.
[12]And they brought the captives, and the prey, and the spoil, unto Moses, and Eleazar the priest, and unto the congregation of the children of Israel, unto the camp at the plains of Moab, which are by Jordan near Jericho.
[13]And Moses, and Eleazar the priest, and all the princes of the congregation, went forth to meet them without the camp.
[14]And Moses was wroth with the officers of the host, with the captains over thousands, and captains over hundreds, which came from the battle.
[15]And Moses said unto them, Have ye saved all the women alive?
[16]Behold, these caused the children of Israel, through the counsel of Balaam, to commit trespass against the LORD in the matter of Peor, and there was a plague among the congregation of the LORD.
[17]Now therefore kill every male among the little ones, and kill every woman that hath known man by lying with him.
[18]But all the women children, that have not known a man by lying with him, keep alive for yourselves. - Bible Numbers 31:9-18 (bible torah)

0 Abu Sa'id, did you hear Allah's Messenger (ﷺ) mentioning al-'azl? He said: Yes, and added: We went out with Allah's Messenger (ﷺ) on the expedition to the Bi'l-Mustaliq and took captive some excellent Arab women; and we desired them, for we were suffering from the absence of our wives, (but at the same time) we also desired ransom for them. So we decided to have sexual intercourse with them but by observing 'azl (Withdrawing the male sexual organ before emission of semen to avoid-conception). But we said: We are doing an act whereas Allah's Messenger is amongst us; why not ask him? So we asked Allah's Mes- senger (ﷺ), and he said: It does not matter if you do not do it, for every soul that is to be born up to the Day of Resurrection will be born. - Hadith Muslim 1438a (islam)
Book 16, Hadith 146
Book 8, Hadith 3371

And whoever among you cannot [find] the means to marry free, believing women, then [he may marry] from those whom your right hands possess of believing slave girls. And Allah is most knowing about your faith. You [believers] are of one another. So marry them with the permission of their people and give them their due compensation according to what is acceptable. [They should be] chaste, neither [of] those who commit unlawful intercourse randomly nor those who take [secret] lovers. But once they are sheltered in marriage, if they should commit adultery, then for them is half the punishment for free [unmarried] women. This [allowance] is for him among you who fears sin, but to be patient is better for you. And Allah is Forgiving and Merciful. - Quran An-Nisa(The Women) 4:25 (islam)

But let them who find not [the means for] marriage abstain [from sexual relations] until Allah enriches them from His bounty. And those who seek a contract [for eventual emancipation] from among whom your right hands possess - then make a contract with them if you know there is within them goodness and give them from the wealth of Allah which He has given you. And do not compel your slave girls to prostitution, if they desire chastity, to seek [thereby] the temporary interests of worldly life. And if someone should compel them, then indeed, Allah is [to them], after their compulsion, Forgiving and Merciful. - Quran An-Nur(The Light) 24:33 (islam)

The Prophet (ﷺ) said, "If a slave-girl commits illegal sexual intercourse and it is proved beyond doubt,
then her owner should lash her and should not blame her after the legal punishment. And then if she
repeats the illegal sexual intercourse he should lash her again and should not blame her after the legal
punishment, and if she commits it a third time, then he should sell her even for a hair rope." - Hadith Al Bukhari 2152 (islam)
Book 34, Hadith 104
Vol. 3, Book 34, Hadith 362

And [also prohibited to you are all] married women except those your right hands possess. [This is] the decree of Allah upon you. And lawful to you are [all others] beyond these, [provided] that you seek them [in marriage] with [gifts from] your property, desiring chastity, not unlawful sexual intercourse. So for whatever you enjoy [of marriage] from them, give them their due compensation as an obligation. And there is no blame upon you for what you mutually agree to beyond the obligation. Indeed, Allah is ever Knowing and Wise. - Quran An-Nisa(The Women) 4:24 (islam)

He can go back to her provided that she has not begun her third - Fiqh Rissala 32.14d (islam)

It is halal to have sexual intercourse with women of the People of the - Fiqh Rissala 32.6b (islam)

A slave who commits fornication receives fifty lashes, as does a - Fiqh Rissala 37.22b (islam)