It is possible that some hadiths may sound odd us in their meanings. And also there could be some naqils said metaphorically but seems like oppositsite each other seemingly. Rejecting or ridiculing with these hadith regardless their authenticity is not a scientific aspect. For this purpose, we have examined the narrative about killing the lizard which is accepted as a means of getting reward (sawab). In this article we criticized separately all the narratives and different tariqs of this hadith. In addition, we also analyzed the text and tried to define all discrepancies in the changing of text. We have also interpreted the hadith and tried to amend of misunderstandings.