Ephesians 1:13
In whom ye likewise believed, after ye had heard the word of truth, the gospel of your salvation; in whom having believed, ye were also sealed by that Holy Spirit of promise,
Ephesians 4:30
And grieve not the Holy Spirit of God, whereby ye are sealed unto the day of redemption.
2 Timothy 2:19
But the foundation of God standeth fast, having this seal, The Lord knoweth those that are his: and, Let every one who nameth the name of the Lord 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,