King James Version
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.English Standard Version
For the power of the horses is in their mouths and in their tails, for their tails are like serpents with heads, and by means of them they wound.Catholic Public Domain Version
For the power of these horses is in their mouths and in their tails. For their tails resemble serpents, having heads; and it is with these that they cause harm