Psalm 35:11 — "False witnesses did rise up; they laid to my charge things that I knew not" — is one of the lament psalms addressed to God as judge and defender: "Plead my cause, O LORD, with them that strive with me" (v.1). The Hebrew rib — "plead" — is the word for legal advocacy, arguing a case on someone's behalf. David asks God to be his lawyer. The appropriate response to slander in Scripture is not primarily self-defense but appealing to the one advocate whose advocacy cannot be corrupted.
1 Peter 2:12 — "Having your conversation honest among the Gentiles: that, whereas they speak against you as evildoers, they may by your good works, which they shall behold, glorify God in the day of visitation" — gives the long-term response to slander. The Greek kalopoia — good works — are the answer to false speech. Not argument, not social media correction, but the observable pattern of life that outlasts the slander.
Commentary is from a charismatic Protestant perspective, drawing on KJV text and public-domain sources including Spurgeon, Andrew Murray, and Matthew Henry.