California Codes, Civil Code - CIV, Division 3 — Obligations, Part 3 — Obligations Imposed by Law, Section 1713
The restoration required by the last section must be made without demand, except where a thing is obtained by mutual mistake, in which case the party obtaining the thing is not bound to return it until he has notice of the mistake.
Notes
Requires restoration under the preceding rule to be made without demand, except when the thing was obtained through mutual mistake. In that exception, the person who received the thing is not required to return it until receiving notice of the mistake.
Use as reference
Lexinter.net | California Code, Civil Code - CIV § 1713 | https://laws.lexinter.net/codes/california/civil-code/division-3/part-3/section-1713