Tosefta for Psalms 58:5

חֲמַת־לָ֗מוֹ כִּדְמ֥וּת חֲמַת־נָחָ֑שׁ כְּמוֹ־פֶ֥תֶן חֵ֝רֵ֗שׁ יַאְטֵ֥ם אָזְנֽוֹ׃

Their venom is like the venom of a serpent; They are like the deaf asp that stoppeth her ear;