What is the ruling regarding a husband's rejection of the hadith: "Accursed is he who has intercourse with his wife in her anus," and his saying: "Everything is permissible for the husband from his wife"? What do you advise the wife to do if she does not want a divorce?

What your husband claims about the permissibility of anal intercourse is false; it is forbidden and a major sin. Some scholars have gone so far as to rule that separation between spouses is obligatory if they agree to anal intercourse, due to the deterrent punishment involved. Explain this to your husband. If he does not return to the truth, then it is not permissible to obey him in this reprehensible act, even if it leads to divorce, for obedience is only in what is right.