Proverbs 10:19 says restraining lips is prudent — directly parallel to guarding the mouth to preserve life.

Proverbs 12:13 says the wicked are ensnared by their lips — same principle: speech leads to ruin.

Proverbs 21:23 states that keeping mouth and tongue keeps one out of trouble — identical teaching to guarding the mouth preserving life.

Proverbs 10:8 similarly contrasts the wise who listen with the chattering fool who is ruined, reinforcing the same principle.

Proverbs 10:14 states that the fool's mouth brings ruin — directly matching the second half of the proverb about opening wide lips.

Proverbs 18:7 explicitly says a fool's mouth is his ruin and his lips a snare — directly echoing the consequence of not guarding speech.

Proverbs 4:23 emphasizes guarding the heart as the source of life — the mouth's speech flows from it, linking to the need to guard one's words.

Psalm 39:1 resolves to guard the tongue from sin — parallels guarding the mouth to preserve life.

Matthew 12:36 warns of judgment for every careless word — expands the consequence of opening lips to eternal accountability.

Matthew 12:37 declares justification or condemnation by words — directly echoes that guarding or opening the mouth determines destiny.

James 1:26 echoes the same warning — failing to control speech makes one's religion worthless, paralleling the ruin of the one who opens wide his lips.

James 3:2-12 expands on the tongue's power to cause great harm, reinforcing the proverb's warning about guarding one's speech.

Psalm 17:3 declares David purposed not to let his mouth transgress — an example of guarding the mouth, which the proverb commends.