Psalms 58:5 - Wesley's Explanatory Notes

Not hearken — As they commonly say of the adders, such really are these men: deaf to all my counsels, to their own consciences, and to God's law. Of the charming or enchanting of serpents, mention is made both in other places of scripture, and in all sorts of authors, ancient and modern, Hebrew and Arabick, and Greek and Latin. And particularly the Arabick writers (to whom these creatures were best known) name some sorts of serpents, among which the adder is one, which they call deaf, not because they are dull of hearing, but, as one of them expressly faith, because they will not be charmed.