Revelation 9:19

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

Ephesians 4:14

that we may no longer be babes, billow-tossed, and carried about with every wind of teaching, in the sleight of men, in the craftiness suited to the artifice of error;

Revelation 9:10

And they have tails like scorpions, and stings; and in their tails is their power 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; and in their tails is their power to hurt men five months.
Ephesians 4:14
that we may no longer be babes, billow-tossed, and carried about with every wind of teaching, in the sleight of men, in the craftiness suited to the artifice of error;