English translation
[2961] 157 - (1222) It was narrated from Abū Mūsā that he used to issue Fatwa allowing Mut'ah,[1] and a man said to him: "Exercise restraint in some of your Fatwa, for you do not know what the Commander of the Believers has introduced concerning the rituals." After that I met him and asked him about that. 'Umar said: 'I know that the Prophet ﷺ and his Companions did that, but I did not want married people to have intercourse beneath the trees and then go out for Hajj with their heads dripping.'"
