Revelation 9:4

and it was commanded them that they should not hurt the grass of the earth, nor any green thing, nor any tree, but only those men who have not the seal of God upon their foreheads;

2 Corinthians 1:22

he who also sealed us, and gave the Spirit as a pledge in our hearts.

Revelation 14:1

And I saw, and lo! the Lamb stood on Mount Zion, and with him a hundred and fortyfour thousand, having his name and the name of his Father written on their foreheads.

Revelation 7:2-3

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,

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 20:4

And I saw thrones; and they sat on them, and judgment was given to them; and I saw the souls of those beheaded on account of the testimony to Jesus, and on account of the word of God, and of all who had not worshipped the beast, nor his image, and had not received his mark upon their forehead, or upon their hand; and they lived, and reigned with Christ a thousand years.

2 Corinthians 12:21

and lest, when I come again, my God will humble me among you, and that I shall bewail many of those who have sinned already, and did not repent of the uncleanness, and fornication, and lasciviousness, which they committed.

Ephesians 4:30

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

2 Peter 2:8-9

(for that righteous man dwelling among them, in seeing and hearing tormented his righteous soul from day to day with their lawless deeds;)

Revelation 13:6-7

And he opened his mouth in blasphemies against God, to blaspheme his name, and his tabernacle, and those who dwell in heaven.

Treasury of Scripture Knowledge

Summary

And the LORD said unto him, Go through the midst of the city, through the midst of Jerusalem, and set a mark upon the foreheads of the men that sigh and that cry for all the abominations that be done in the midst thereof.

General references

Bible References

That sigh

2 Corinthians 12:21
and lest, when I come again, my God will humble me among you, and that I shall bewail many of those who have sinned already, and did not repent of the uncleanness, and fornication, and lasciviousness, which they committed.
2 Peter 2:8
(for that righteous man dwelling among them, in seeing and hearing tormented his righteous soul from day to day with their lawless deeds;)

General references

Matthew 5:4
Blessed are they who mourn; for they will be comforted.
Romans 9:2
I have great grief and unceasing anguish in my heart.