Cross Reference GENESIS 4:15 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

{Genesis 4:15} And the LORD 3068 said 559 z8799 unto him, Therefore 3651 whosoever x3605 slayeth 2026 z8802 Cain, 7014 vengeance shall be taken 5358 z8714 on him sevenfold. 7659 And the LORD 3068 set 7760 z8799 a mark 226 upon Cain, 7014 lest 1115 any x3605 finding 4672 z8802 him should kill 5221 z8687 him.

Therefore:
"And also¹ by the handª of the prophetª Jehuª the sonª of Hananiª came¹ the wordª of the LORDª against¹ Baasha,ª and against¹ his house,ª even for¹ all¹ the evilª that¹ he didª ° in the sightª of the LORD,ª in provoking him to angerª ° with the workª of his hands,ª in being¹ like the houseª of Jeroboam;ª and because¹ ¹ he killedª ° him." {1Kg 16:7} + "Slayª ° them not,¹ lest¹ my peopleª forget:ª ° scatterª ° them by thy power;ª and bring them down,ª ° O Lordª our shield.ª" {Psa 59:11} + "And the LORDª saidª ° unto¹ him, Callª ° his nameª Jezreel;ª for¹ yet¹ a littleª [while], and I will avengeª °¹ the bloodª of Jezreelª upon¹ the houseª of Jehu,ª and will cause to ceaseª ° the kingdomª of the houseª of Israel.ª" {Hsa 1:4} + "Thenª saidª ° Jesusª unto him,ª Put up againª ° thyª swordª intoª hisª place:ª forª all¹ they² that takeª ° the swordª shall perishª ° withª the sword.ª" {Mtt 26:52}

sevenfold:
"Ifª Cainª shall be avengedª ° sevenfold,ª truly Lamechª seventyª and sevenfold.ª" {Gen 4:24} + "And if¹ ye will not¹ yet² for¹ all this¹ hearkenª ° unto me, then I will punishª ° you seven timesª moreª ° for¹ your sins.ª" {Lev 26:18} + "And if¹ ye walk² °¹ contraryª unto¹ me, and willª ° not¹ hearkenª ° unto me; I will bring² ° seven times² moreª °¹ plaguesª upon¹ you according to your sins.ª" {Lev 26:21} + "Then will I¹ also¹ walkª ° contraryª unto¹ you, and will punishª ° you yetª seven timesª for¹ your sins.ª" {Lev 26:24} + "Then I will walkª ° contraryª unto¹ you also in fury;ª and I, evenª I,¹ will chastiseª ° you seven timesª for¹ your sins.ª" {Lev 26:28} + "And renderª ° unto our neighboursª sevenfoldª into¹ their bosomª their reproach,ª wherewith¹ they have reproachedª ° thee, O Lord.ª" {Psa 79:12} + "But [if] he be found,ª ° he shall restoreª ° sevenfold;ª he shall giveª °¹ all¹ the substanceª of his house.ª" {Prv 6:31}

set a mark:
etc. Or, rather, "gave a sign or token to Cain, that those who found him should not kill him." "And the LORDª saidª ° unto¹ him, Go throughª ° the midstª of the city,ª through the midstª of Jerusalem,ª and setª ° a markª upon¹ the foreheadsª of the men² ¹ that sighª ° and that cryª ° for¹ all¹ the abominationsª that be doneª ° in the midstª thereof." {Ezk 9:4} + "Slayª ° utterlyª oldª [and] young,ª both maids,ª and little children,ª and women:ª but come not nearª °¹ ¹ any¹ manª upon¹ whom¹ [is] the mark;ª and beginª ° at my sanctuary.ª ¹ Then they beganª ° at the ancientª men² ¹ which¹ [were] beforeª the house.ª" {Ezk 9:6} + "Andª the thirdª angelª followedª ° them,ª sayingª ° withª a loudª voice,ª If any manª worshipª ° the¹ beastª andª his² ¹ image,ª andª receiveª ° [his] markª inª his² ¹ forehead,ª orª inª his² ¹ hand,ª" {Rev 14:9} + "Andª the¹ smokeª of their² ¹ tormentª ascendeth upª ° for² ever² and ever:ª ¹ andª they haveª ° noª restª dayª norª night,ª who² worshipª ° the¹ beastª andª his² ¹ image,ª andª whosoeverª receivethª ° the¹ markª of his² ¹ name.ª" {Rev 14:11}