Why do the rules change between the Old Testament and the New Testament?
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Whosoever Will, The One Story: If you have ever felt the Bible lurch, the rules changing between one section and the next, no bacon here but bacon there, sacrifices then and no sacrifices now, Thread 5, the Dispensational Map, is what explains it. Scripture is not one flat undifferentiated rulebook. It is a plan that unfolds in distinct stages, distinct economies, each with its own terms, all of them moving toward a literal Kingdom. God dealt with Adam one way, with Israel under the law another, with the Church in the age of grace another, and He will deal with the world in the Kingdom another still. This is not God changing His mind. It is one author moving a single story through its acts. Once you can see the stages, the apparent contradictions dissolve, because you stop reading a promise made to Israel as though it were addressed to you, and you start seeing where you actually stand in the plan, and what is still coming.
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Why do the rules change between the Old Testament and the New Testament? → wsb.bible/answers/why-do-the-rules-change-between-the-old-testament-and-the-new
This answer is the short form. The argument is made at length in The One Story: He Has a Plan, and It Unfolds in Stages.