Cain in the context of "Grain offering"

Fratricide (from Latin fratricidium; from frater 'brother' and -cīdium 'killing' – the assimilated root of caedere 'to kill, cut down') is the act of killing one's own brother.

It can either be done directly or via the use of either a hired or an indoctrinated intermediary (an assassin). The victim need not be the perpetrator's biological brother. In a military context, fratricide refers to a service member killing a comrade.

Grendel is a fictional character in the Anglo-Saxon epic poem Beowulf (700–1000 AD). He is one of the poem's three antagonists (along with his mother and the dragon), all aligned in opposition against the protagonist Beowulf. He is referred to as both an eoten and a þyrs, types of beings from wider Germanic mythology. He is also described as a descendant of the Biblical Cain and "a creature of darkness, exiled from happiness and accursed of God, the destroyer and devourer of our human kind." He is usually depicted as a monster or a giant, although his status as a monster, giant, or other form of supernatural being is not clearly described in the poem and thus remains the subject of scholarly debate. The character of Grendel and his role in the story of Beowulf have been subject to numerous reinterpretations and re-imaginings. Grendel is feared by all in Heorot but Beowulf, who kills both him and his mother.

Homicide is an act in which a person causes the death of another person. A homicide requires only a volitional act, or an omission, that causes the death of another, and thus a homicide may result from accidental, reckless, or negligent acts even if there is no intent to cause harm.

Homicides can be divided into many overlapping legal categories, such as murder, manslaughter, justifiable homicide, assassination, killing in war (either following the laws of war or as a war crime), euthanasia, and capital punishment, depending on the circumstances of the death. These different types of homicides are often treated very differently in human societies; some are considered crimes, while others are permitted or even ordered by the legal system.

Jubal (also Yuval, Yubal or Tubal; Hebrew: יוּבָל – Yūḇāl) is a biblical figure in Genesis 4:21 of the Hebrew Bible and Old Testament. Mentioned only once, he is sometimes regarded by Christians, particularly by medieval commentators, as the 'inventor of music'. A descendant of Cain, his father is Lamech and his brother is Jabal.

Abel (Hebrew: הֶבֶל Hébel, in pausa הָבֶל‎ Hā́ḇel; Biblical Greek: Ἅβελ Hábel; Arabic: هابيل, Hābēl) is a biblical figure in the Book of Genesis within the Abrahamic religions. Born as the second son of Adam and Eve, the first two humans created by God, he was a shepherd who offered his firstborn flock to God as a religious offering (Genesis 4:1–8). God accepted Abel's offering but not that of his older brother Cain, leading Cain to kill Abel out of jealousy; some later interpretations suggest that Cain may have slain him with a stone. This act marked the first death in biblical history, making Abel the first murder victim.

In the biblical Book of Genesis, Cain and Abel are the first two sons of Adam and Eve. Cain, the firstborn, was a farmer, and his brother Abel was a shepherd. The brothers made sacrifices, each from his own fields, to God. God had regard for Abel's offering, but had no regard for Cain's. Cain killed Abel and God considered it murder, cursing Cain and sentencing him to a life of transience. Cain then dwelt in the land of Nod (נוֹד, 'wandering'), where he built a city and fathered the line of descendants beginning with Enoch. Thus, Cain was the first person born, and Abel the first to die.

The New Testament Epistle to the Hebrews interprets Abel’s sacrifice as more acceptable than Cain’s because it was offered in faith, earning Abel the approval of God. In the Qur'an, Cain and Abel are known as Qābīl (Arabic: قابيل) and Hābīl (هابيل), respectively. In Islamic tradition, the story of Cain and Abel portrays Cain as the first murderer driven by jealousy and lust, guided by the devil, and punished with guilt and disgrace, with some scholars debating the identity and motives of the brothers. In the Sethian Apocryphon of John, Cain and Abel are Archons, children of the Demiurge Yaldabaoth, named Yahweh and Elohim but called Cain and Abel to deceive.

In the Abrahamic religions, Seth was the third son of Adam and Eve. The Hebrew Bible names two of his siblings (although it also states that he had others): his brothers Cain and Abel. According to Genesis 4:25, Seth was born after Abel's murder by Cain, and Eve believed that God had appointed him as a replacement for Abel.
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The Nephilim (/ˈnɛfɪˌlɪm/; Hebrew: נְפִילִים, romanized: Nəfīlīm) are mysterious beings or humans mentioned in the Hebrew Bible, traditionally understood as being of great size and strength, or alternatively beings of great power and authority. The origins of the Nephilim are unclear. Some writers, including the author of the Book of Enoch, view them as the offspring of rebellious angels and humans. Others view them as descendants of Seth and Cain.

The first biblical reference to them is in Genesis 6:4, but verses 1-4 are ambiguous and the identity of the Nephilim is disputed. According to Numbers 13:33, ten of the Twelve Spies report the existence of Nephilim in Canaan prior to its conquest by the Israelites. A similar or identical Biblical Hebrew term, read as "Nephilim" by some scholars and as the word "fallen" by others, appears in Ezekiel 32:27 and is also mentioned in the deuterocanonical books Judith 16:6, Sirach 16:7, Baruch 3:26–28, and Wisdom 14:6.

"Generations of Adam" is a genealogical concept recorded in Genesis 5:1 in the Hebrew Bible. It is typically taken as the name of Adam's line of descent going through Seth. Another view equates the generations of Adam with material about a second line of descent starting with Cain in Genesis 4, while Genesis 5 is taken as the "generations of Noah".