Revelation 7:3

7:3 “Do not damage the earth or the sea or the trees until we have put a seal on the foreheads of the servants of our God.”

Revelation 2:20

2:20 But I have this against you: You tolerate that woman Jezebel, who calls herself a prophetess, and by her teaching deceives my servants to commit sexual immorality and to eat food sacrificed to idols.

Revelation 10:7

10:7 But in the days when the seventh angel is about to blow his trumpet, the mystery of God is completed, just as he has proclaimed to his servants the prophets.”

Revelation 13:16

13:16 He also caused everyone (small and great, rich and poor, free and slave) to obtain a mark on their right hand or on their forehead.