Is it permissible to pray behind an imam who errs in reciting the Qur’an, such as by pronouncing the letter (dhāl) as (zāy) in His saying, the Most High: (the path of those upon whom You have bestowed favor) and His saying, the Most High: (When there comes the help of Allah and the conquest)?

It is not permissible to pray behind someone who makes errors in Al-Fatihah and replaces the letter "dhāl" (ذ) with "zāy" (ز), as his prayer is invalidated if he is able to learn. However, if he is unable to learn, his prayer is valid, but only those who are like him should follow him in prayer.