Ephesians 1:13
You also have heard the message of the truth, the good news of your salvation, and believed in him, and through union with him you have been marked with the seal of the holy Spirit that was promised,
Ephesians 4:30
You must not offend God's holy Spirit, with which you have been marked for the Day of Redemption.
2 Timothy 2:19
Yet God's solid foundation stands unshaken, bearing this inscription, "The Lord knows those who belong to him," and "Everyone who uses the name of the Lord must give up evil."
Revelation 7:2
Then I saw another angel ascend from the east with the seal of the living God, and he cried out in a loud voice to the four angels who had it in their power to harm the earth and the sea,