Obligation of contracts

OBLIGATION OF CONTRACTS. By this expression, which is used in the constitution of the United States, is meant a legal and not merely a moral duty. 4 Wheat. 107. The obligation of contracts consists in the necessity under which a man finds himself to, do, or to refrain from doing something. This obligation consists generally both in foro legis and in foro conscientice, though it does at times exist in one of these only. It is certainly of the first, that in foro legis, which the framers of the constitution spoke, when they prohibited the passage of any law impairing the obligation of contract. 1 Harr. Lond. Rep. Lo. 161. See Impairing the obligation of contracts.

References in classic literature ?
No State shall enter into any Treaty, Alliance, or Confederation; grant Letters of Marque and Reprisal; coin Money; emit Bills of Credit; make any Thing but gold and silver Coin a Tender in Payment of Debts; pass any Bill of Attainder, ex post facto Law, or Law impairing the Obligation of Contracts, or grant any Title of Nobility.
Constitutional scholars have said the law appears to violate the 14th Amendments Equal Protection Clause, as well as the clause of Article I, Section 10 that prohibits states from passing laws "impairing the obligation of contracts.
Therefore, it would not violate the constitutional restriction on impairing the obligation of contracts.
Moreover, the Constitution prohibits the states from passing any law that impairs the obligation of contracts.
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