I don't know this question is within the scope or not. Its straightforward. How many of the Laws in OT can be transported to NT and usable? These are some of the OT laws which are no longer useful ...
Matthew 5:17-18 (KJV) 17 Think not that I am come to destroy the law, or the prophets: I am not come to destroy, but to fulfil. 18 For verily I say unto you, Till heaven and earth pass, one jot ...