A false witness that speaketh lies, and he that soweth discord among brethren.
A false witness that speaketh lies - literally, 'blows out' or 'breathes out lies' (cf. Psalms 10:5, "He puffeth at them" - his enemies). False witness is a particular manifestation of "a lying tongue" (Proverbs 6:17).
He that soweth discord among brethren - by whisperings, and slanders, and flatteries. Such are the results of idleness (Proverbs 6:6-10; Sir 33:27 , 'Idleness teacheth much evil'). This clause marks the connection of Proverbs 6:16-19 with Proverbs 6:12-15 (cf. Proverbs 6:14, "He soweth discord").