(38) باب اسْتِحْبَابِ قَتْلِ الْوَزَغِ
Abu Huraira reported Allah's Messenger (ﷺ) as saying:
He who killed a gecko 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.
Reference: Sahih Muslim 2240 a
In-book reference: Book 39, Hadith 197
USC-MSA web (English) reference(deprecated numbering scheme): Book 26, Hadith 5564