Revelation 7:2-3

A seal was used by kings to identify things, particularly messages or commands, as his. It left an impression in hot wax that belonged only to him. (Genesis 41:42; Esther 3:10; Esther 8:2) A fifth angel carries God's seal and commands the four angels to continue restraining the destructive forces until God's people could be marked. The East is the direction light comes from to a darkened world. Christians are sealed with the Holy Spirit to show they are truly God's people. (Ephesians 1:13; Ephesians 4:30; Romans 8:15-16) However, when we see the 144,000 in chapter 14, they have the name of God written on their foreheads, so this may be the seal. Before the destruction of Jerusalem in 586 B. C., Ezekiel had a vision of God's faithful being marked and kept safe. (Ezekiel 9:1-6)