Dawud bin Abd al-Jabbar said: I went out with Ibrahim bin Jarir to a funeral, and he was riding. When we reached the graveyard, a snake came out. Ibrahim said: My father (Sayyiduna Jarir (may Allah be pleased with him)) told me that he heard the Prophet (peace and blessings be upon him) say: "Whoever sees a snake and does not kill it out of fear of it is not of me."
Hadith Referenceالمعجم الكبير للطبراني / باب الجيم / 2281