Ephesians 1:13

in Whom ye also??fter having heard the word of the truth, the Gospel of your salvation, in Whom having also believed??ere sealed with the Holy Spirit of promise,

Ephesians 4:30

And grieve not the Holy Spirit of God, in Whom ye were sealed unto the day of redemption.

2 Timothy 2:19

Nevertheless, the firm foundation of God has been standing, having this seal, "The Lord knew those who are His:" and "Let every one who names the name of the Lord depart from unrighteousness."

Revelation 7:2

And I saw another angel ascending from the rising of the sun, having a seal of the living God; and he cried with a great voice to the four angels, to whom it was given to hurt the earth and the sea,

Treasury of Scripture Knowledge

Summary

With the work of an engraver in stone, like the engravings of a signet, shalt thou engrave the two stones with the names of the children of Israel: thou shalt make them to be set in ouches of gold.

Bible References

Engravings of a signet

Ephesians 1:13
in Whom ye also??fter having heard the word of the truth, the Gospel of your salvation, in Whom having also believed??ere sealed with the Holy Spirit of promise,
Ephesians 4:30
And grieve not the Holy Spirit of God, in Whom ye were sealed unto the day of redemption.
2 Timothy 2:19
Nevertheless, the firm foundation of God has been standing, having this seal, "The Lord knew those who are His:" and "Let every one who names the name of the Lord depart from unrighteousness."
Revelation 7:2
And I saw another angel ascending from the rising of the sun, having a seal of the living God; and he cried with a great voice to the four angels, to whom it was given to hurt the earth and the sea,