Doubts Regarding Nikah Al-Mut'ah

Question :

I have read in some books that Al-Mut'ah is permissible and that the evidence for that is the Saying of Allah, Most High:
"so with those of whom you have enjoyed sexual relations, give them their Mahr as prescribed."
and that Al-Mut'ah was only outlawed after the death of the Prophet and that the weight of opinion is that it was 'Umar, may Allah be pleased with him, who outlawed it and the fourth Caliph, 'Ali Ibn Abi Talib, may Allah be pleased. with him, said: "If "Umar had not declared Al-Mut'ah illegal, no one would commit adultery except a wretched person." What is the truth of this information?

Answer:

A At the beginning of Islam, it was permitted, because the people had only recently abandoned disbelief. So it was permitted for them in order to soften their hearts. Then the Prophet prohibited it from the time of the conquest (of Makkah) until the Day of Resurrection. It was not 'Umar, may Allah be pleased with him, who forbade it; 'Umar, may Allah be pleased with him, only forbade the Mut'ah of Hajj and so some of them mistakenly accused him of it. As for what is reported from 'Ali, may Allah be pleased with him, it is only a lie and a falsehood spread by the Shiites. As for the Verse, it refers to marriage, and the payment is the dowries as in His Words:
"And give to the women (whom you marry) their Mahr (obligatory bridal-money given by the hushand to his wife at the time of marriage) with a good heart."
And Allah knows best.

Source:
Ibn Jibreen.
Fatawa Islamiyah, Vol. 5 Pages 407-408