Seller’s obligation to deliver

The seller is obligated to transfer the ownership of and deliver the object of the sale, as well as answer for its warranty.[1]

The buyer acquires ownership of the thing sold from the moment it is delivered to him: (a) through the various modes of delivery, or (b) in any other manner signifying an agreement that the possession is transferred from the vendor to the vendee.[2] Not mere agreements but tradition or delivery transfers the ownership of things (Non nudis pactis sed traditione dominia rerum transferentur).[3]

Continue reading here.