Many times there are external or internal signs of the covenant. Some signs are the rainbows for Noah (Gen.9:12-15), the Sabbath day for Moses (Ex.16:25, 26), circumcision for Abraham (Gen.17:9-11) and the circumcision of the heart for the believer in the New Covenant (Rom.2:25-29). Covenants are always structured. In Exodus and Deuteronomy, they are divided into four parts. The first part is the history of each participant, a record of what each person has done until the present. The second part is the laws, showing what is required of each person to do in the covenant. The third part is the mutual obligations. This is where each person agrees to the covenant and show what will happen if they break the covenant. The fourth part is the conclusion of the covenant. This part is to seal the covenant with oaths, a solemn meal, sacrifices, exchanging clothes and passing between a cut up animal. When a covenant is broken, it can be rewritten between the two parties. In rewriting the covenant, it doesn’t change the covenant, but it renews it and is still considered a new covenant.