Sunan at-Tirmithiy كتاب الصيد والذبائح باب ما جاء فى قتل الوزغ
The Messenger of God, peace and blessings of God be upon him, said, "Whoever kills a gecko from the first blow earns a certain amount of recorded merits (1). If one kills it from the second blow, one earns a certain amount of recorded merits; and if one kills it from the third blow, one earns a certain amount of recorded merits (2)." Footnotes: (1): The credit recorded for performing a righteous deed accountable on the Day of Judgment. (2): A lesser amount everytime. . Click on ḥadīth to read more