'Tongue' in the Bible

If any man among you seem to be religious, and bridleth not his tongue, but deceiveth his own heart, this man's religion is vain.

Even so the tongue is a little member, and boasteth great things. Behold, how great a matter a little fire kindleth!

And the tongue is a fire, a world of iniquity: so is the tongue among our members, that it defileth the whole body, and setteth on fire the course of nature; and it is set on fire of hell.

But the tongue can no man tame; it is an unruly evil, full of deadly poison.