Salam alaikum.

Below you would see scan pages from book “Minhaj as-Sadiqin” by Kashani. That’s volume #2, pp 492-493.

First highlighted quote says:

Nabi (sallalahu alaihi wa ali) said: Whoever would make mutah once, he would free 1/3 of him from (hell) fire. And whoever would make mutah twice, he would free (another) 1/3 from (hell) fire. And who would make mutah thrice, he would free all of him from (hell) fire”.

Third highlighted quote says:

“Whoever would make mutah once, his level would be equal to level of Hussain (alaihi salam). And whoever would make mutah twice, his level would be like level of Hasan (alaihi salam). Whoever would make mutah thrice, his level would be like level of Ali ibn Abu Talib (alaihi salam). And whoever would make mutah 4 times, his level would be like mine”.