question #2 Sahih al-Bukhari 6961, Book 90, Hadith 8 : What are the implications of a marriage being considered illegal or its conditions being deemed illegal in Islamic jurisprudence?

`Ali was told that Ibn `Abbas did not see any harm in the Mut’a marriage. `Ali said, “Allah’s Messenger (ﷺ)
forbade the Mut’a marriage on the Day of the battle of Khaibar and he forbade the eating of donkey’s
meat.” Some people said, “If one, by a tricky way, marries temporarily, his marriage is illegal.” Others
said, “The marriage is valid but its condition is illegal.”