Ephesians 1:13
in whom you also hoped after you heard the word of truth, the gospel of your salvation: in whom, after you also believed, you were sealed with the Holy Spirit of promise,
Ephesians 4:30
and grieve not the Holy Spirit of God, with which you have been sealed for the day of redemption.
2 Timothy 2:19
But the foundation of God stands firm, having this inscription: The Lord knows those who are his; and, Let every one that names the name of Christ depart from iniquity.
Revelation 7:2
And I saw another angel ascending from the east, having the seal of the living God: and he cried with a loud voice to the four angels, to whom it was given to hurt the earth and the sea,