Hadith.31 - Jabir ibn Yazid al-Ju'fi about a gecko falling into a well.
Imam (as) said: "It is nothing (to worry about); stir the water with a bucket."
Al-Kāfi #25“This is about the case of al-Sam al-Abras (a poisonous snake) that falls in the well. Abu Ja‘far (a.s.), has said, ‘It is not harmful. Just...