Article 1583 of the French Civil Code

It is perfected between the parties, and ownership is acquired by operation of law by the buyer as against the seller, as soon as the thing and the price have been agreed, even though the thing has not yet been delivered or the price paid.

Original in French 🇫🇷

Article 1583

Elle est parfaite entre les parties, et la propriété est acquise de droit à l’acheteur à l’égard du vendeur, dès qu’on est convenu de la chose et du prix, quoique la chose n’ait pas encore été livrée ni le prix payé.