John Trapp on 1 John 5:18

Verſe 18. Sinneth nor] ſc. That ſin to death, v. 16. not other ſins, as other men do. See the Note on Chap. 3.9.

And that wicked one toncheth him not] viz. Tactu qualitativo, as Cajetan expoundeth it, with a deadly touch: he thruſts not in his ſting ſo far as to infuſe the venome of that ſin that is properly his ſin, Joh. 8.44. and with which he toucheth their ſpirits that become the ſerpents feed.