Louisiana became the first state to mandate that the Ten Commandments be displayed in every public school classroom. Republican Gov. Jeff Landry did not sign or veto the bill, but it became law when the deadline to act on it passed on Wednesday.

The legislation requires a poster-sized display of the Ten Commandments in “large, easily readable font” in all public classrooms, from kindergarten to state-funded universities. Supporters claim the law is of historical significance, noting that the Ten Commandments are “foundational documents of our state and national government.”

The posters will be funded through private donations, not taxpayer money. Opponents argue the law is unconstitutional and have threatened lawsuits, referencing a 1980 U.S. Supreme Court ruling that struck down a similar Kentucky law as having no secular purpose.