Not only will their names be written in the Book of Life, but they will also be recorded in a special Book of Remembrance because they remembered to reverence and sanctify His name. They memorialized it. The sun shall be turned into darkness, and the moon into blood, before the great and the terrible day of Yahweh come. Notice the seal that is placed on the forehead of the 144,000 is not the seal of sabbath keeping, but instead, the sacred names of Yahweh and Yahshua. This is exactly what is happening today.
All nations have a name for their particular god who they say created the universe.
But His people know Him by His personal revealed name. And that name is Yahweh. Dagon and Molech are also called gods in the Bible. Yahweh's name is holy just as the Sabbath is holy. It must be sanctified or set apart just as the Sabbath is.