My husband insists that I cut my hair. He says that I am sinful for refusing to obey his wishes.

Answer

You are supposed to obey Allah Azza Wa Jal. Rasulullah (sallallahu alayhi wasallam) said: "Obedience to anyone in anything which involves disobedience to the Creator is not permissible." Your first obligation is to obey Allah Ta'ala. Whenever there is a clash between the wishes of people and the commands of Allah Ta'ala, it is compulsory to obey Allah Ta'ala and to ignore the wishes of others even if they are one's parents or the husband. It is haraam for you to cut your hair.