Cap. 16 Art. 1857Object of mandate.

(1) Every mandate must have for its object something lawful which the mandator might have done himself.

(2) Subject to any other special provision of the law, a mandate can be granted by a public deed, by a private writing, by letter, or verbally, or even tacitly.

(3) An irrevocable mandate granted by way of security as specified in article 1887(1) shall be granted in writing on pain of nullity.