The mouth of a fool is his destruction: and his lips are the ruin of his soul.

A fool's mouth is destruction to him, and his lips are a snare to his soul.

The mouth of a foolish man is his destruction, and his lips are a net for his soul.

A fool's mouth is his destruction,.... The cause of it; for his contentions, and quarrels, and evil speaking, lawsuits are commenced against him, which bring ruin upon himself and his family now; as well as for his idle and wicked words he will be condemned hereafter, Matthew 12:35; there is a world of iniquity in the mouth and tongue of a wicked man, which bring destruction upon himself and others, James 3:6;
and his lips are the snare of his soul; from speaking in his own defence, he says things which should not be said, and by which he is entangled yet more and more; he is caught by his own words and condemned by them; or his loquacity, in which he delights, is a snare unto him to say things which neither become him, nor are for his advantage, but the contrary; see Proverbs 12:13.

7 The mouth of the fool is to him destruction,
And his lips are a snare to his soul.
As Proverbs 18:6 corresponds to Proverbs 17:27 of the foregoing group, so this Proverbs 18:7 corresponds to Proverbs 17:28. Regarding מחתּה־לּו, vid., Proverbs 13:3. Instead of פי כּסיל, is to be written פּי־כסיל, according to Torath Emeth, p. 40, Cod. 1294, and old editions.