Narrated Abu Hurairah: The Prophet ﷺ said: We have not made peace with them since we fought with them, so he who leaves any of them alone through fear does not belong to us.
Hadith Referenceسنن ابي داود / أبواب السلام / 5248
Hadith Gradingالألبانی:حسن صحيح | زبیر علی زئی:إسناده حسن, مشكوة المصابيح (4139), محمد بن عجلان صرح بالسماع عند أحمد (2/432)
Hadith Takhrij« تفرد بہ أبوداود، (تحفة الأشراف: 14142)، وقد أخرجہ: مسند احمد (2/247، 432، 520) (حسن صحیح) »
Sayyiduna Abu Hurairah (may Allah be pleased with him) narrates: The Noble Prophet (peace and blessings be upon him) said: "We have started fighting them, we have not made peace with them, and whoever, out of fear of them, lets any one of them go, he has no relation with us." The Noble Prophet (peace and blessings be upon him) meant snakes.
Shaykh Muhammad Ibrahim bin Basheer
Benefit: In this hadith, the command has been given to kill snakes—that wherever you see one, kill it, even if it is in the Haram (sanctuary). There were some snakes present in Madinah Munawwarah, so the Prophet (sallallahu alayhi wa sallam) had prohibited killing them at that time. However, later on, a general command was given that wherever there is a snake, kill it. Now, this is the ruling; the previous prohibition is abrogated.
Source: Musnad al-Humaydi: Commentary by Muhammad Ibrahim bin Bashir, Page: 1188