Now may you be cursed far from the soil that drank the blood of your brother that you have shed. When you till the soil, it shall not be fruitful for you. You shall be a fugitive and wanderer upon the earth.”

Cain told the Lord, “My punishment is too great to bear! Behold, you are banishing me from the soil this day. I will have to hide far from you. I will be a fugitive and wanderer upon the earth, and whoever meets me will be able to kill me.” But the Lord told him, “Not so! Whoever kills Cain will suffer a sevenfold vengeance.” The Lord placed a mark upon Cain, so that no one who might meet him would strike him.

Genesis 4:11-15 NCB.