They belch out— The original verb בעה bangah, properly signifies the bubbling noise of water rising out of a spring. Hence it is used in a good and bad sense of what is uttered by the mouth, according as that is good or evil. In the good sense we have it, Proverbs 1:23. In the place before us, it is taken in the bad sense, and denotes those numerous threatenings, calumnies, and imprecations, which David's pursuers poured out against him. Swords are in their lips, says he. Their threatenings were cruel and deadly: Psalms 57:4 and the calumnies which they privately insinuated to Saul, such as made him determine his destruction, especially as David had not the liberty of vindicating himself. Therefore it is added, For who heareth? They vented their calumnies more freely and dangerously, because privately; so that none could refute them. Chandler.
Related Commentaries of Psalms 59:7
Psalms 59:7
7 Behold, they belch out with their mouth: swords are in their lips: for who, say they, doth hear?