Revelation 13:17-18

Living Bible

¹⁷ And no one could get a job or even buy in any store without the permit of that mark, which was either the name of the Creature or the code number of his name. ¹⁸ Here is a puzzle that calls for careful thought to solve it. Let those who are able, interpret this code: the numerical values of the letters in his name add to 666!^[a]