God's word is authoritative, having proceeded from Him, from His heart/Spirit. It says in His word that He magnifies His word above all His name. That tells me that His word is His bond and He holds Himself to it....and that He will never disannul or cancel or contradict anything that He has said in His word, nor do anything contrary to it. He is not a man that He should lie.
But scripture says we are to serve in the new way of the Spirit, not in the old way of the letter. Serving in the old way apart from God, His Spirit, is where we may see some putting the dead letter above the person of the living God (ie, worshiping it)......The Lord is alive and His word is alive, and His Spirit needs to be involved, otherwise we will neither understand nor use the word as God intends, but by the flesh. It's like judges are living people and they are needed to interpret the Law and it's intent, as well as to justly apply the Law, taking mitigating factors into account and applying mercy where applicable, or severity when that is applicable, etc. We don't know the explicit will of God and how to understand or apply His word in every situation without His Spirit.