Should We Kill Lizards?
An incident took place in Saur cave where Prophet and Abu Bakkar Siddique(Peace be upon them)were hiding to escape from enemies.A spider web hid the cave.But a lizard made a noise and broke the web,which would have helped enemies to find our Prophet and Siddique(Peace be upon them).Based on this there is a Hadith in Sahih Muslim that we should kill Lizards.Is this true?I do not know the Hadith No.,but since you are Scholars it will be easy for you to find out I hope Insha Allah.Thank you.Was Salaam.
As for the story you mentioned about a lizard breaking the web, I was not able to find it. On the contrary, the reports about spider webs (as mentioned in some of the history books) narrate that a spider made web by God's order and that the web was one of the main reasons that Mushrekeen did not enter the cave, thinking that no one could be in the cave (refer to Arryaz Annazra, vol. 1, pp. 457, Dala'el Annabowwa, vol. 1, pp. 66, 76, Akhbar Makka, vol. 4, pp. 83).
Disregarding the story you mentioned; in terms of 'killing lizard', you first need to appreciate the difference between lizards and salamanders. The first is typically referred to as, "Al-Zabba" in Arabic while the latter is what is mostly referred to as "Al-Wazaq" in Arabic. Lizards are reptiles, while salamanders are amphibians.
It is the killing of salamanders (and not lizard) that is a matter of debate. It is true that there are Ahadith encouraging killing salamanders. Some of these are as follows:
Narrated 'Aisha: Allah's Apostle called the salamander a bad animal, but I did not hear him ordering it to be killed." (Bukhari - Volume 3, Book 29, Number 57)
Narrated Aisha: The Prophet called the Salamander, a mischief-doer. I have not heard him ordering that it should be killed. Sad bin Waqqas says that the Prophet ordered that it should be killed. (Bukhari - Volume 4, Book 54, Number 525)
Narrated Um Sharik: Allah's Apostle ordered that the salamander should be killed and said, "It (i.e. the salamander) blew (the fire) on Ibrahim." (Bukhari Volume 4, Book 55, Number 579)
Narrated Abu Huraira: Allah's Messenger (may peace be upon him) as saying: He who killed a Salamander with the first stroke for him is such and such a reward, and he who killed it with a second stroke for him is such and such reward less than the first one, and he who killed it with the third stroke for him is such and such a reward less than the second one. (Muslim Book 026, Number 5564)