Revelation 9:4

but they were told not to harm the grass on earth nor any green thing nor any tree, only such human beings as had not the seal of God upon their foreheads;

2 Corinthians 1:22

who stamped me with his seal and gave me the Spirit as a pledge in my heart.

Revelation 14:1

Then I looked, and there was the Lamb standing on mount Sion, and along with him a hundred and forty-four thousand bearing his name and the name of his Father written on their foreheads!

Revelation 7:2-3

And I saw another angel rise up from the east, with the seal of the living God; he shouted aloud to the four angels who were allowed to injure the earth and sea,

2 Timothy 2:19

But the solid foundation laid by God remains, and this is its inscription: the Lord knows who are his, and 'let everyone who names the name of the Lord give up evil.'

Revelation 20:4

And I saw thrones with people sitting on them, who were allowed to judge ??saw the souls of those who had been beheaded for the testimony of Jesus and God's word, those who would not worship the Beast or his statue, and who would not receive his mark on their forehead or hand; they came to life and reigned along with the Christ for a thousand years.

Ephesians 4:30

And do not vex God's holy Spirit, by whom you have been sealed for the day of redemption.

2 Peter 2:8-9

(for when that righteous man resided among them, by what he saw and heard his righteous soul was vexed day after day with their unlawful doings) ??9 then be sure the Lord knows how to rescue pious folk from trial, and how to keep the unrighteous under punishment till the day of doom,

Revelation 13:6-7

so he opened his mouth for blasphemies against God, to blaspheme his name and his dwelling (that is, the dwellers 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.

That sigh

General references

Bible References

That sigh

2 Peter 2:8
(for when that righteous man resided among them, by what he saw and heard his righteous soul was vexed day after day with their unlawful doings) ??9 then be sure the Lord knows how to rescue pious folk from trial, and how to keep the unrighteous under punishment till the day of doom,

General references

Matthew 5:4
Blessed are the mourners! they will be consoled.
Romans 9:2
when I say that I am in sore pain. I suffer endless anguish of heart.