אִם־יִשֹּׁ֥ךְ הַנָּחָ֖שׁ בְּלוֹא־לָ֑חַשׁ וְאֵ֣ין יִתְר֔וֹן לְבַ֖עַל הַלָּשֽׁוֹן׃
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Zohar
Once, for example, R. Eleazar was walking along accompanied by R. Hezekiah, when they came across a snake. R. Hezekiah was about to kill it, but R. Eleazar said: ‘Nay, leave it alone, do not kill it! ‘ Said R. Hezekiah to him: ‘But is it not a noxious creature which kills people?’ To which R. Eleazar replied: ‘It is written :”Doth the serpent bite without enchantment? (lit. whispering)” (Eccl. 10, 11). The serpent does not bite unless it be whispered to from above and commanded to kill some one,