""Khan v. Hasan, the New York intermediate appellate court held that a mahr agreement under which the husband agreed to pay a sum of money to the wife in the event of divorce was unenforceable under New York state law because the verbal agreement did not conform to New York's laws on matrimonial agreements, which require such agreements to be in writing. The Court further held with regard to the question of applying Islamic law to interpret the alleged agreement: 'It is without question that when courts must touch upon questions of religious concerns, they may not consider religious doctrine.'"