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.)