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 .
In Ezekiel 3:7 the word "impudent" is rightly rendered in the Revised Version "an hard forehead." (See also ver. 8,9.)
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".