in their tails
Revelation 9:10
And they had tails like unto scorpions, and there were stings in their tails: and their power was to hurt men five months.
Isaiah 9:15
The ancient and honourable, he is the head; and the prophet that teacheth lies, he is the tail.
Ephesians 4:14
That we henceforth be no more children, tossed to and fro, and carried about with every wind of doctrine, by the sleight of men, and cunning craftiness, whereby they lie in wait to deceive;