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 4:24 (islam)

-Even if their husband is alive (Muslim 1456a)?
- Why the Saabah (the companions) were reluctant to do so, are they better than Mohamed and Allah?
- Is the penalty for having sex with a free married women death?
- Why is there a difference with the married one?
- If those slaves were not Muslim was their marriage considered void?
- Why the Quran is not clear about that?
- Is it permissible in Fiqh to have sex with a Muslim slave?
- Since there is no limitation in time, is it the Origin of Mutha/Misyar?

Chapter: Mut'ah Marriage: It was permitted then abrograted, then permitted then abrogated, and it will remain Forbidden until the day of resurrection

Iyas b. Salama reported on the authority of his father that Allah's Messenger (ﷺ) gave sanction for contracting temporary marriage for three nights in the year of Autas 1847 and then forbade it. - Sahih:Muslim:1405f (islam)

Chapter: Allah's Messenger (saws) prohibited Nikah-al-Mut'a lately.
Salama bin Al-Akwa` said:
Allah's Messenger (ﷺ)'s said, "If a man and a woman agree (to marry temporarily), their marriage should last for three nights, and if they like to continue, they can do so; and if they want to separate, they can do so." I do not know whether that was only for us or for all the people in general. Abu `Abdullah (Al-Bukhari) said: `Ali made it clear that the Prophet said, "The Mut'a marriage has been cancelled (made unlawful). - Sahih:Al Bukhari:5119 (islam)

Chapter: Allah's Messenger (saws) prohibited Nikah-al-Mut'a lately.
Narrated Abu Jamra:
I heard Ibn `Abbas (giving a verdict) when he was asked about the Mut'a with the women, and he permitted it (Nikah-al-Mut'a). On that a freed slave of his said to him, "That is only when it is very badly needed and women are scarce." On that, Ibn `Abbas said, "Yes." - Sahih:Al Bukhari:5116 (islam)

Chapter: The Thrice Divorced Woman Cannot Return To Her Husband Until She Re-Marries
Narrated Aisha, Ummul Mu'minin:
The Messenger of Allah (ﷺ) was asked about a man who divorced his wife three times, and she married another who entered upon her, but divorced her before having intercourse with her, whether she was lawful for the former husband. She said: The Prophet (ﷺ) replied: She is not lawful for the first (husband) until she tastes the honey of the other husband and he tastes her honey. - Sahih:Abu Dawud:2309 (islam)

-If the point is to prevent to much divorce, why punish the wives and not the husband?

Chapter: To divorce one's wife thrice (at a time)
Narrated `Aisha:
The wife of Rifa`a Al-Qurazi came to Allah's Messenger (ﷺ) and said, "O Allah's Messenger (ﷺ)! Rifa`a divorced me irrevocably. After him I married `Abdur-Rahman bin Az-Zubair Al-Qurazi who proved to be impotent." Allah's Messenger (ﷺ) said to her, "Perhaps you want to return to Rifa`a? Nay (you cannot return to Rifa`a) until you and `Abdur-Rahman consummate your marriage." - Sahih:Al Bukhari:5260 (islam)

And if he has divorced her [for the third time], then she is not lawful to him afterward until [after] she marries a husband other than him. And if the latter husband divorces her [or dies], there is no blame upon the woman and her former husband for returning to each other if they think that they can keep [within] the limits of Allah. These are the limits of Allah, which He makes clear to a people who know. - Quran:Al-Baqarah 2:230 (islam)

-What happen if you remarry anyway, is the new marriage valid, is it fornication, while you be subjected to flogging or stoning?
- Are you really obliged to remarry and have sex with another man?
- Is it true that some Iman present themselves as a solution to the 'problem'?