Cross reference
Revelation 9:19
19 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;
Isaiah 9:15
15 Elder, and accepted of face, he `is' the head, Prophet, teacher of falsehood, he `is' the tail.
Ephesians 4:14
14 that we may no more be babes, tossed and borne about by every wind of the teaching, in the sleight of men, in craftiness, unto the artifice of leading astray,
Revelation 9:10
10 and they have tails like to scorpions, and stings were in their tails; and their authority `is' to injure men five months;