Louisiana on Wednesday ordered the Ten Commandments to be posted in every schoolroom in the conservative southern US state, an unprecedented decision that reopens the debate over church/state separation.

Louisiana’s Republican governor, Jeff Landry, signed a law requiring the Ten Commandments to be posted in every public school classroom — from daycare centers to publicly funded universities — beginning in the new school year.

As “if you want to respect the rule of law, you have to start from the archetypal law, that of Moses”, he declared during the signing ceremony of the bill.

The law provides that the ten commandments will be posted in frames or posters, in a large size and font so that they are clearly visible.

The powerful American rights and liberties organization ACLU warned that the matter will be decided in the courts.

“The law violates the separation of church and state and is clearly unconstitutional,” she said in a statement.

The first amendment to the US Constitution prohibits the establishment of a national religion, as well as the favoring of any religion over another.

Other conservative US states in the so-called “Bible Belt” of the southern US have tried to enact similar measures, but this is the first time it has been done by law.