Ephesians 1:13
in whom you also, having heard the word of truth, the gospel of your salvation, in whom, also having believed, you were sealed with the Holy Spirit of promise,
Ephesians 4:30
And grieve not the Holy Spirit of God, by whom you were sealed unto the day of redemption.
2 Timothy 2:19
The foundation of God stands solid indeed, having this seal, The Lord knows them that are his: and; Let every one naming the name of the Lord depart from iniquity.
Revelation 7:2
And I saw another angel coming up from the rising of the sun, having the seal of the living God: and he cried with a great voice to the four angels, to whom it was given unto them to hurt the earth and the sea,