The legislation that Republican Gov. Jeff Landry signed into law on Wednesday requires a poster-sized display of the Ten Commandments in "large, easily readable font" in all public classrooms, from kindergarten to state-funded universities.

"If you want to respect the rule of law, you've got to start from the original lawgiver, which was Moses" who got the commandments from God, Landry said.

Opponents questioned the law's constitutionality and vowed to challenge it in court. Proponents said the measure is not solely religious, but that it has historical significance. In the language of the law, the Ten Commandments are "foundational documents of our state and national government."

The posters, which will be paired with a four-paragraph "context statement" describing how the Ten Commandments "were a prominent part of American public education for almost three centuries," must be in place in classrooms by the start of 2025.

Under the law, state funds will not be used to implement the mandate. The posters would be paid for through donations.

The law also "authorizes" but does not require the display of other items in K-12 public schools, including: The Mayflower Compact, which was signed by religious pilgrims aboard the Mayflower in 1620 and is often referred to as America's "First Constitution"; the Declaration of Independence; and the Northwest Ordinance, which established a government in the Northwest Territory — in the present day Midwest — and created a pathway for admitting new states to the Union.

Not long after the governor signed the bill into law at Our Lady of Fatima Catholic School in Lafayette on Wednesday, civil rights groups and organizations that want to keep religion out of government promised to file a lawsuit challenging it.