Revelation 9:19

For the power of the horses [to kill] is in their mouths and in their tails, for their tails are like snakes that have heads with which to harm people.

Ephesians 4:14

Then we will no longer be [spiritual] babies, tossed back and forth [by waves], and blown around by every wind of [false] teaching, [deceived] by the clever trickery of people using deceptive schemes.

Revelation 9:10

And they had tails like scorpions with stingers, and in their tails they had the power to inflict harm upon people 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
And they had tails like scorpions with stingers, and in their tails they had the power to inflict harm upon people for five months.
Ephesians 4:14
Then we will no longer be [spiritual] babies, tossed back and forth [by waves], and blown around by every wind of [false] teaching, [deceived] by the clever trickery of people using deceptive schemes.