Revelation 9:19

For the power of the horses is in their mouths and in their tails; their tails being like serpents, and having heads, and it is with them that they inflict injury.

Ephesians 4:14

So we shall no longer be babes nor shall we resemble mariners tossed on the waves and carried about with every changing wind of doctrine according to men's cleverness and unscrupulous cunning, making use of every shifting device to mislead.

Revelation 9:10

They had tails like those of scorpions, and also stings; and in their tails lay their power of injuring mankind for 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
They had tails like those of scorpions, and also stings; and in their tails lay their power of injuring mankind for five months.
Ephesians 4:14
So we shall no longer be babes nor shall we resemble mariners tossed on the waves and carried about with every changing wind of doctrine according to men's cleverness and unscrupulous cunning, making use of every shifting device to mislead.