Genesis 4:15

And Jehovah said to him, Therefore whoever kills Cain shall be avenged seven times. And Jehovah set a mark upon Cain so that anyone who found him should not kill him.

Ezekiel 9:4

And Jehovah said to him, Go through in the midst of the city, in the midst of Jerusalem, and set a mark on the foreheads of the men who are groaning and are mourning because of all the abominations that are done in her midst.

Ezekiel 9:6

Fully destroy old men, young men and virgins, and little children and women. But do not come near any man on whom is the mark. And begin at My sanctuary. And they began at the old men who were before the house.

Genesis 4:24

For Cain is avenged seven times, and Lamech seventy-seven times.

Psalm 79:12

and give to our neighbors their curse sevenfold into their bosom, the curse with which they have cursed You, O Lord.

Revelation 14:9

And a third angel followed them, saying with a great voice, If anyone worships the beast and its image, and receives a mark in his forehead or in his hand,

Revelation 14:11

And the smoke of their torment goes up forever and ever. And they have no rest day or night, those who worship the beast and its image, and whoever receives the mark of its name.

Leviticus 26:18

And if you will not yet listen to Me for all this, then I will punish you seven times more for your sins.

Leviticus 26:21

And if you walk contrary to Me, and will not listen to Me, I will bring seven times more plagues on you according to your sins.

Leviticus 26:24

then I will walk contrary to you and will punish you seven times more for your sins.

Leviticus 26:28

then I will walk contrary to you also in fury. And I, even I, will chastise you seven times for your sins.

1 Kings 16:7

And also by the hand of the prophet Jehu the son of Hanani came the Word of Jehovah against Baasha, and against his house, even for all the evil that he did in the sight of Jehovah, in provoking Him to anger with the work of his hands, in being like the house of Jeroboam, and because he killed him.

Psalm 59:11

Do not kill them, lest my people forget; scatter them by Your power and bring them down, O Jehovah our shield.

Proverbs 6:31

but if he is found, he shall restore sevenfold; he shall give all the goods of his house.

Hosea 1:4

And Jehovah said to him, Call his name God Will Sow. For still in a little while, and I will avenge the blood of Jezreel on the house of Jehu, and will cause the kingdom of the house of Israel to cease.

Matthew 26:52

Then Jesus said to him, Put up your sword again into its place; for all who take the sword shall perish with a sword.

Treasury of Scripture Knowledge

Summary

And the LORD said unto him, Therefore whosoever slayeth Cain, vengeance shall be taken on him sevenfold. And the LORD set a mark upon Cain, lest any finding him should kill him.

Set a mark, etc

Bible References

Therefore

1 Kings 16:7
And also by the hand of the prophet Jehu the son of Hanani came the Word of Jehovah against Baasha, and against his house, even for all the evil that he did in the sight of Jehovah, in provoking Him to anger with the work of his hands, in being like the house of Jeroboam, and because he killed him.
Psalm 59:11
Do not kill them, lest my people forget; scatter them by Your power and bring them down, O Jehovah our shield.
Hosea 1:4
And Jehovah said to him, Call his name God Will Sow. For still in a little while, and I will avenge the blood of Jezreel on the house of Jehu, and will cause the kingdom of the house of Israel to cease.
Matthew 26:52
Then Jesus said to him, Put up your sword again into its place; for all who take the sword shall perish with a sword.

Sevenfold

Genesis 4:24
For Cain is avenged seven times, and Lamech seventy-seven times.
Leviticus 26:18
And if you will not yet listen to Me for all this, then I will punish you seven times more for your sins.
Psalm 79:12
and give to our neighbors their curse sevenfold into their bosom, the curse with which they have cursed You, O Lord.
Proverbs 6:31
but if he is found, he shall restore sevenfold; he shall give all the goods of his house.

Set a mark, etc

Ezekiel 9:4
And Jehovah said to him, Go through in the midst of the city, in the midst of Jerusalem, and set a mark on the foreheads of the men who are groaning and are mourning because of all the abominations that are done in her midst.
Revelation 14:9
And a third angel followed them, saying with a great voice, If anyone worships the beast and its image, and receives a mark in his forehead or in his hand,