A group of Oklahoma parents of public school students, teachers and ministers filed a lawsuit seeking to stop the state’s top education official from forcing schools to incorporate the Bible into lesson plans for students in grades 5 through 12.

Petitioners behind the lawsuit include religious leaders, public school teachers and parents in Oklahoma who argue the measure is harmful.

Oklahoma Schools Superintendent Ryan Walters is facing a lawsuit over his mandate requiring all public schools to teach the Bible, with more than a dozen petitioners—including religious leaders, parents,