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.

Treasury of Scripture Knowledge

Summary

For, behold, I will send serpents, cockatrices, among you, which will not be charmed, and they shall bite you, saith the LORD.

Bible References

I will

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.