26 Their malice may be concealed by deception, but their wickedness will be exposed in the assembly.

Read Proverbs 26:26 Using Other Translations

Whose hatred is covered by deceit, his wickedness shall be shewed before the whole congregation.
though his hatred be covered with deception, his wickedness will be exposed in the assembly.
While their hatred may be concealed by trickery, their wrongdoing will be exposed in public.