The practice common among Oriental nations of colouring the forehead or impressing on it some distinctive mark as a sign of devotion to some deity is alluded to in Revelation 13:16 Revelation 13:17 ; 14:9 ; 17:5 ; 20:4 .
The "jewel on thy forehead" mentioned in Ezekiel 16:12 (RSV, "a ring upon thy nose") was in all probability the "nose-ring" ( Isaiah 3:21 ).
In Ezekiel 3:7 the word "impudent" is rightly rendered in the Revised Version "an hard forehead." (See also ver. 8,9.)
These dictionary topics are from
M.G. Easton M.A., D.D., Illustrated Bible Dictionary, Third Edition,
published by Thomas Nelson, 1897. Public Domain, copy freely.
[J] indicates this entry was also found in Jack Van Impe's Prophecy Dictionary
[S] indicates this entry was also found in Smith's Bible Dictionary
Bibliography InformationEaston, Matthew George. "Entry for Forehead". "Easton's Bible Dictionary". .