Colossians 4:5

Show tact in your behavior to the outside world, making the most of every opportunity.

Hebrews 2:1

Therefore we must give still more heed to what we were taught, for fear we should drift away.

James 1:26

When a man appears to be religious, yet does not bridle his tongue, but imposes upon his own conscience, that man's religious observances are valueless.

James 3:2-8

We often make mistakes, every one of us. Any one who does not make mistakes when speaking is indeed a perfect man, able to bridle his whole body as well.

Treasury of Scripture Knowledge

Summary

{To the chief Musician, even to Jeduthun, A Psalm of David.} I said, I will take heed to my ways, that I sin not with my tongue: I will keep my mouth with a bridle, while the wicked is before me.

I said

My mouth, etc

General references

Bible References

I said

Hebrews 2:1
Therefore we must give still more heed to what we were taught, for fear we should drift away.

My mouth, etc

James 1:26
When a man appears to be religious, yet does not bridle his tongue, but imposes upon his own conscience, that man's religious observances are valueless.
James 3:2
We often make mistakes, every one of us. Any one who does not make mistakes when speaking is indeed a perfect man, able to bridle his whole body as well.

While

Colossians 4:5
Show tact in your behavior to the outside world, making the most of every opportunity.

General references

James 3:3
When we put bits into horses' mouths, to make them obey us, we control the rest of their bodies so.