Ephesians 1:13

in whom ye also, after having heard the word of truth, the glad tidings of your salvation, in whom, I say, having also believed, ye were sealed with the Holy Spirit that was promised,

Ephesians 4:30

and grieve not the Holy Spirit of God, whereby ye were sealed unto the day of redemption.

2 Timothy 2:19

Nevertheless Gods firm foundation standeth, having this seal, "The Lord knoweth them that are his;" and, "Let every one that nameth 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 loud 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, after having heard the word of truth, the glad tidings of your salvation, in whom, I say, having also believed, ye were sealed with the Holy Spirit that was promised,
Ephesians 4:30
and grieve not the Holy Spirit of God, whereby ye were sealed unto the day of redemption.
2 Timothy 2:19
Nevertheless Gods firm foundation standeth, having this seal, "The Lord knoweth them that are his;" and, "Let every one that nameth 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 loud voice to the four angels, to whom it was given to hurt the earth and the sea,