Genesis 4:15

וַ יֹּאמֶר לֹו יְהוָה לָכֵן כָּל הֹרֵג קַיִן שִׁבְעָתַיִם יֻקָּם וַ יָּשֶׂם יְהוָה לְ קַיִן אֹות לְ בִלְתִּי הַכֹּות אֹתֹו כָּל מֹצְאֹו

And Yahweh is saying to-himself, `To an upright, the whole of the one-who-slays Spearhead, seven-times he is being avenged.¹⁸⁰` And Yahweh is placing for Spearhead a sign to except the smiting of אֶת-him the whole of him-who-finds him.¹⁸¹

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and he is, the whole finding me, he is slaying me. Yahweh said that anyone who kills Cain is avenged sevenfold. Cain is being equated numerically with seven.

Lamech we learn is 70. Jesus teaches about forgiving certain brothers, “Then Peter came up and said to him, ‘Master, how often will my brother miss into me, and I forgive him? As many as seven times?’ Jesus said to him, ‘I do not say to you, up to seven times, but up to seventy times seven.’” (Matt. 18:21-22. “if he missed into you seven times in the Hot-one, and turns to you seven times, saying, ‘I turn-back,’ you must forgive him.” (Luke 17:4). Forgive us our misses, as we forgive those who missed against us.

places to (or for) Spearhead a sign. The word “sign” is from the Hebrew oth (Strong’s #226) and means sign, mark, symbol. It is used of the rainbow in Genesis 9:12, flag emblems in Num. 2:2, the luminaries in Gen. 1:14, the circumcision in Gen. 17:11, etc. It is always used of something visible and objective. The Hebrew itself is identical to the mark of the accusative את which constitute the first and last letters of the alphabet:

אוֹת

“sign, mark”