Art. 1156. An obligation is a juridical necessity to give, to do or not to do. (n)

Art. 1157. Obligations arise from:

(1) Law;

(2) Contracts;

(3) Quasi-contracts;

(4) Acts or omissions punished by law; and

(5) Quasi-delicts. (1089a)

Art. 1158. Obligations derived from law are not presumed. Only those expressly determined in this Code or in special laws are demandable, and shall be regulated by the precepts of the law which establishes them; and as to what has not been foreseen, by the provisions of this Book. (1090)

Art. 1159. Obligations arising from contracts have the force of law between the contracting parties and should be complied with in good faith. (1091a)

Art. 1160. Obligations derived from quasi-contracts shall be subject to the provisions of Chapter 1, Title XVII, of this Book. (n)

Art. 1161. Civil obligations arising from criminal offenses shall be governed by the penal laws, subject to the provisions of Article 2177, and of the pertinent provisions of Chapter 2, Preliminary Title, on Human Relations, and of Title XVIII of this Book, regulating damages. (1092a)

Art. 1162. Obligations derived from quasi-delicts shall be governed by the provisions of Chapter 2, Title XVII of this Book, and by special laws. (1093a)