Covenant: properly, a disposition, i.e.(specially) a contract (especially a devisory will):--covenant, testament.<quoted text>
The first two are EXACTLY my point. The OT is a covenant between God and the nation of Israel. It contained instructions for the building up of the nation of Israel. The NT is a covenant between God and "the Church". The Church being we the people. The NT supercedes the OT, or is intended to when it comes to Christianity.
As for cutting one's hair and shaving, it is part of the same Levitican Laws the anti-gay crowd likes to continually quote out of context.
The OT and the NT are contracts. They are between God and mankind..