Proverbs 30:32

If you have been foolish by exalting yourself, and if you have devised evil, [put your] hand to [your] mouth.

Job 21:5

Turn to me and be appalled, and place [your] hand on [your] mouth.

Job 40:4

"Look, I am insignificant. What shall I answer you? I lay my hand on my mouth.

Proverbs 17:28

Even a fool who keeps silent {shall be considered wise}; he who closes his lips [is] intelligent.

Proverbs 26:12

[Do] you see a man wise in his own eyes? [There is more] hope for a fool than for him.

Ecclesiastes 8:3-4

Do not be terrified of his presence! Go at once and do not delay when a matter [is] unpleasant, for he can do anything that he desires.

Micah 7:16-17

The nations will see and be ashamed because of all their might. They will lay [the] hand on [the] mouth; their ears will be deaf.

Romans 3:19

Now we know that whatever the law says, it speaks to those under the law, in order that every mouth may be closed and the whole world may become accountable to God.

Treasury of Scripture Knowledge

Summary

If thou hast done foolishly in lifting up thyself, or if thou hast thought evil, lay thine hand upon thy mouth.

Bible References

Thou hast done

Proverbs 26:12
[Do] you see a man wise in his own eyes? [There is more] hope for a fool than for him.
Ecclesiastes 8:3
Do not be terrified of his presence! Go at once and do not delay when a matter [is] unpleasant, for he can do anything that he desires.

Lay

Proverbs 17:28
Even a fool who keeps silent {shall be considered wise}; he who closes his lips [is] intelligent.
Job 21:5
Turn to me and be appalled, and place [your] hand on [your] mouth.
Job 40:4
"Look, I am insignificant. What shall I answer you? I lay my hand on my mouth.
Ecclesiastes 8:4
Since the word of the king [is] supreme, no one can say to him, "What are you doing?"
Micah 7:16
The nations will see and be ashamed because of all their might. They will lay [the] hand on [the] mouth; their ears will be deaf.
Romans 3:19
Now we know that whatever the law says, it speaks to those under the law, in order that every mouth may be closed and the whole world may become accountable to God.