The document discusses a debate between Rabbi Abaye and Rabba about whether a lost object without an identifying mark must be returned if found. Abaye says it is not considered ownerless/abandoned yet since the owner does not know it was lost. Rabba says if the owner knew it was lost, they would consider it abandoned, so the finder can keep it. They agree an object with a mark must be returned, unless lost in water where God permits the finder to keep it.