Revelation 9:4

And order was given them, not to hurt the grass of the earth, nor any green thing, nor any tree; but only the men, who had not the seal of God on their foreheads.

2 Corinthians 1:22

and given us the earnest of the Spirit in our hearts.

Revelation 14:1

Then I looked and behold a Lamb standing on mount Sion, and with Him an hundred forty and four thousand, having his Father's name written on their foreheads.

Revelation 7:2-3

And I saw another angel which ascended 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 hurt the earth and the sea,

2 Timothy 2:19

However, the foundation of God standeth firm, having this inscription, The Lord knoweth them that are his; and, Let every one that nameth the name of Christ depart from iniquity.

Revelation 20:4

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

2 Corinthians 12:21

when I come again, my God should humble me among you, and I should be grieved for many of those who have sinned heretofore, and have not repented of the impurity, and fornication, and lewdness which they have practised.

Ephesians 4:30

And grieve not the holy Spirit of God whereby ye are sealed to the day of redemption.

2 Peter 2:8-9

(for that good man by seeing and hearing their crimes, when he dwelt among them, tormented his righteous soul from day to day with their

Revelation 13:6-7

And he opened his mouth in blasphemies against God, to blaspheme his name, and his tabernacle, and those that 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
when I come again, my God should humble me among you, and I should be grieved for many of those who have sinned heretofore, and have not repented of the impurity, and fornication, and lewdness which they have practised.
2 Peter 2:8
(for that good man by seeing and hearing their crimes, when he dwelt among them, tormented his righteous soul from day to day with their

General references

Matthew 5:4
Blessed are they that mourn; for they shall be comforted.
Romans 9:2
that I have great grief and continual sorrow in my heart: