New Revised Standard Version
There they are, bellowing with their mouths, with sharp words on their lips— for “Who,” they think, “will hear us?”

Contemporary English Version
They curse, and their words cut like swords, as they say to themselves, "No one can hear us!"

New American Bible
Their mouths pour out insult; sharp words are on their lips. They say: “Who is there to hear?”

Douay-Rheims Bible
Behold they shall speak with their mouth, and a sword is in their lips: for who, say they, hath heard us?

Behold they shall speak with their mouth, and a sword is in their lips: for who, say they, hath heard us?

belch

Proverbs 15:2 The tongue of the wise adorneth knowledge: but the mouth of fools bubbleth out folly.

Matthew 12:34 O generation of vipers, how can you speak good things, whereas you are evil? for out of the abundance of the heart the mouth speaketh.

swords

Psalm 55:21 They are divided by the wrath of his countenance, and his heart hath drawn near. His words are smoother than oil, and the same are darts.

Psalm 57:4 And he hath delivered my soul from the midst of the young lions. I slept troubled. The sons of men, whose teeth are weapons and arrows, and their tongue a sharp sword.

Psalm 64:3-5 For they have whetted their tongues like a sword; they have bent their bow a bitter thing, . . .

Psalm 109:2,3 O God, be not thou silent in my praise: for the mouth of the wicked and the mouth of the deceitful man is opened against me. . . .

Proverbs 12:18 There is that promiseth, and is pricked as it were with a sword of conscience: but the tongue of the wise is health.

who

Psalm 10:11,13 For he hath said in his heart: God hath forgotten, he hath turned away his face not to see to the end. . . .

Psalm 73:11 And they said: How doth God know? and is there knowledge in the most High?

Psalm 94:7-9 And they have said: The Lord shall not see: neither shall the God of Jacob understand. . . .

Job 22:12,13 Dost not thou think that God is higher than heaven, and is elevated above the height of the stars? . . .

Jeremiah 33:24 Hast thou not seen what this people hath spoken, saying: The two families which the Lord had chosen, are cast off: and they have despised my people, so that it is no more a nation before them?