Job 33:2

Behold now, I have opened my mouth. My tongue has spoken in my mouth.

Job 3:1

After this Job opened his mouth, and cursed his day.

Job 31:30

(yea, I have not allowed my mouth to sin by asking his life with a curse);

Psalm 78:2

I will open my mouth in parable{s (LXX/NT)}. I will utter dark sayings of old,

Matthew 5:2

And having opened his mouth, he taught them, saying,

Treasury of Scripture Knowledge

Summary

Behold, now I have opened my mouth, my tongue hath spoken in my mouth.

General references

Bible References

I

Job 3:1
After this Job opened his mouth, and cursed his day.
Psalm 78:2
I will open my mouth in parable{s (LXX/NT)}. I will utter dark sayings of old,
Matthew 5:2
And having opened his mouth, he taught them, saying,

General references

Job 13:6
Hear now my reasoning, and hearken to the pleadings of my lips.
Job 35:16
so Job opens his mouth in vanity. He multiplies words without knowledge.