The Messenger of Allah ﷺ said, "Kill all snakes, and whoever fears their revenge is not from me."
حدثنا عبد الحميد بن بيان السكري عن إسحق بن يوسف عن شريك عن أبي إسحق عن القاسم بن عبد الرحمن عن أبيه
قال رسول الله ﷺ اقتلوا الحيات كلهن فمن خاف ثأرهن فليس مني
[Its chain is daif] Recorded by Nasai, Jihad, chapter on one who betrays a warrior regarding his family, no. 3195, from the hadith of Sharik the judge, and its chain is daif. Sharik used ambiguous transmission wording (anana), but the following hadith, no. 5252, and the preceding one, no. 5248, make it unnecessary.