This one is from the book ‘al-muqni’ by their ‘great scholar’ al-qummi , :

“…he will not talk to her [the woman] any word ; except that Allaah records a virtue for him. And he does not extend his arms towards the woman, except that Allaah records a virtue for him. When he engages in the sexual act with the woman, Allah forgives all of his sins – because of that. And when he takes a bath [after the act]; Allah forgives his sins equal to the amount of water which passed on his hair [ Equal to the amount of hair] .”

second quote :

The Prophet (sallahAllaahu alayhi wasallam), said :
“ Jibreel met me and said: ‘0 Muhammad, Allah says: ‘Indeed I have forgiven those women who practice mut’ah [among yout nation] .”

These quotes are from the book ‘Mustadrak al-wasail’ , it says :

[this is the highlited text ]

From Saleem bin ‘Aqabah that his father said : ‘I asked Imam al-baqir (may peace be on him) is there a reward for the one who does mut’ah.?’
The imaam said: “Yes, if it is practiced for seeking the pleasure of Allah and to oppose fulaan [may be Umar].
And as such he will not talk to her [the woman] any word ; except that Allaah records a virtue for him. And when he gets close to her [engages in the sexual act with the woman] ; Allah forgives for him his sins. And when he takes a bath [after the act]; Allah forgives his sins equal to the amount of water which passed on his hair .”
I [The narrator] said [inquired in surprise]: “Equal to the amount of hair on their bodies?”
The imam replied: “Yes, according to the number of hairs [wet by the water]..”

next quote : [the first underline]
he said : ” Indeed Allaah The Most Mighty The Most Majestic , Has made impermissible for our shia ; all that which intoxicates from any drink – and substituted in its place -for them- Mut’ah.”

next quote : [the last underline]
from baqir who said : The Prophet (sallahAllaahu alayhi wasallam), said :
“When I was being taken to Heaven during the Israa (ascension), Jibreel met me and told me: ‘0 Muhammad, Allah The Most Mighty The Most Majestic says: ‘I have forgiven all [of the sins of] those women who practice mut’ah.”