Article 1357

If the law requires a document or other special form, as in the acts and contracts enumerated in the following article, the contracting parties may compel each other to observe that form, once the contract has been perfected. This right may be exercised simultaneously with the action upon the contract. (1279a)

Kung hinihingi ng batas, ang isang dokumento o iba pang espesyal na porma, na tulad ng gawa at mga kontratang nabanggit sa mga  sumusunod na artikulo, ang nakikipagkontratang partido ay maaring pilitin ang bawat isa na sundin ang itsura hanggang sa mabuo ang kontrata. Ang karapatan na ito ay maaaring gawin ng tuloy-tuloy na may pagkilos sa kontrata.

Example:

Kristia donated a real property to Bryan in a private instrument. The donation is void.

Donation of real property is required to be in a public instrument to be valid.

Sale of Real property orally executed is valid but unenforceable because the law requires it to be in writing. While exchange of land is valid although not in writing.