Revelation 9:19

For the power of the horses is in their mouths and in their tails; for their tails are like serpents, having heads, and with them they do hurt.

Ephesians 4:14

That we may be no longer children, fluctuating to and fro, and carried about with every wind of doctrine, by the slight of men, by cunning craftiness, whereby they lie in wait to deceive:

Revelation 9:10

And they have tails like scorpions, and stings were in their tails; and their power is, to hurt men five months.

Treasury of Scripture Knowledge

Summary

For their power is in their mouth, and in their tails: for their tails were like unto serpents, and had heads, and with them they do hurt.

Bible References

In their tails

Revelation 9:10
And they have tails like scorpions, and stings were in their tails; and their power is, to hurt men five months.
Ephesians 4:14
That we may be no longer children, fluctuating to and fro, and carried about with every wind of doctrine, by the slight of men, by cunning craftiness, whereby they lie in wait to deceive: