Ephesians 1:13

in whom also you, when you heard the word of truth, the gospel of your salvation, in whom also you having believed were sealed with the Holy Spirit of promise,

Ephesians 4:30

And grieve not the Holy Spirit of God, by which you were sealed to the day of redemption.

2 Timothy 2:19

But the foundation of God stands firm, having this seal, The Lord knows them that are his; and, Let every one who names the name of the Lord depart from wickedness.

Revelation 7:2

And I saw another angel ascend 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 injure 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 also you, when you heard the word of truth, the gospel of your salvation, in whom also you having believed were sealed with the Holy Spirit of promise,
Ephesians 4:30
And grieve not the Holy Spirit of God, by which you were sealed to the day of redemption.
2 Timothy 2:19
But the foundation of God stands firm, having this seal, The Lord knows them that are his; and, Let every one who names the name of the Lord depart from wickedness.
Revelation 7:2
And I saw another angel ascend 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 injure the earth and the sea,