Berean Standard Bible (BSB)
For the power of the horses was in their mouths and in their tails; indeed, their tails were like snakes, having heads with which to inflict harm.
World English Bible (WEB)
For the power of the horses is in their mouths, and in their tails. For their tails are like serpents, and have heads, and with them they harm.
Strong's King James
For{G1063} their{G846} power{G1849} is{G1526}{(G5748)}{(G5625)}{G2076}{(G5748)} in{G1722} their{G846} mouth{G4750}, and{G2532} in{G1722} their{G846} tails{G3769}: for{G1063} their{G846} tails{G3769} were like{G3664} unto serpents{G3789}, and had{G2192}{(G5723)} heads{G2776}, and{G2532} with{G1722} them{G846} they do hurt{G91}{(G5719)}.
The F.O.G *
(19) Because the power of the horses is in their mouths and in their tails, for their tails are like serpents having heads and in them they injure.
The F.O.G Message *
Young's Literal Translation
for their authorities are in their mouth, and in their tails, for their tails are like serpents, having heads, and with them they do injure;