NET
8 Now let the king issue a written interdict so that it cannot be altered, according to the law of the Medes and Persians, which cannot be changed.”
Darby
8 Now, O king, establish the decree, and sign the writing, that it be not changed, according to the law of the Medes and Persians, which may not be revoked.
KJV
8 Now, O king, establish the decree, and sign the writing, that it be not changed, according to the law of the Medes and Persians, which altereth not.