Short answer. If you deliver property or pay money by mistake and it turns out to belong to a third person, not to you, the recipient cannot simply keep it as an ordinary payment. Article 2158 requires the payee to follow the same rules Article 1984 sets for property belonging to someone other than the one who delivered it.
What the law says
When the property delivered or money paid belongs to a third person, the payee shall comply with the provisions of article 1984.
Civil Code, Article 2158 — Third Person's Property Paid. Read the full provision →
A payment made in someone else's property
Article 2158 sits inside the Civil Code chapter on quasi-contracts, specifically the rules on solutio indebiti, which govern payments made without any real obligation to pay. Most of that chapter deals with a mistaken payment made from the payor's own funds or property. Article 2158 covers a narrower complication: sometimes the thing delivered, or the money handed over, never belonged to the person who paid it in the first place. It belonged all along to a third person who had nothing to do with the mistaken transaction between payor and payee.
The rule that applies
In that situation, the Code does not invent a fresh procedure. Instead, Article 2158 sends the payee to Article 1984, the same provision used when someone holding a borrowed thing discovers that it actually belongs to a person other than the one who lent it out. By cross-referencing that rule, Article 2158 places the payee in a comparable position: someone who received property honestly but must now account for it to whoever truly owns it, rather than treating the mistaken payment as if it settled ownership.
Why the true owner still matters
The purpose is to stop a two-party mistake from quietly wiping out a third person's ownership. The payee may have accepted the property or money in good faith, genuinely believing the payment was valid and complete. None of that changes the underlying fact that someone outside the transaction actually owns what changed hands. The payee's duties toward that true owner survive the handover, so a private payment error between two people cannot, by itself, defeat the property rights of someone who was never part of it.
How this connects to the surrounding articles
Article 2158 also sits between two closely related provisions on undue payments. Article 2157 addresses what happens when several people jointly and solidarily received a mistaken payment, while Article 2159 addresses a payee who accepted the payment knowing it was not really owed. Reading the three together shows how the chapter tries to sort out mistaken payments fairly across a range of complications, from multiple payees, to bad faith, to property that belonged to someone else entirely. For someone who mistakenly paid with property that was never theirs to give, tracing the transaction back through these related articles clarifies both what the payee owes and to whom.
Related provisions
- Civil Code, Article 2158 — Third Person's Property Paid
- Civil Code, Article 2157 — Solidary Liability of Payees
- Civil Code, Article 1984 — No Duty to Prove Ownership; Stolen Things