The Plural Bloods of the Slain Brother
How the biblical text uses the plural 'bloods' (damim) to imply all future generations.
God asks Cain where Abel is; when Cain deflects ('Am I my brother's keeper?'), God declares that the voice of his brother's bloods (*dəmê*, plural) cries out from the ground.
“Yahweh said to Cain, 'Where is Abel, your brother?' He said, 'I don't know. Am I my brother's keeper?' Yahweh said, 'What have you done? The voice of your brother's blood cries to me from the ground.'”
The court admonishes witnesses that in capital cases, the blood of the accused and the blood of all his potential descendants until the end of the world is hanging upon them, citing the plural 'bloods' in Genesis 4:10.
“In capital cases the witness is held responsible for the blood of the accused and the blood of his descendants until the end of the world. For so we find with Cain, who killed his brother, as it is written: 'The voice of the bloods of your brother cries out to Me from the ground' (Genesis 4:10). It does not say 'the blood of your brother', but rather 'the bloods of your brother'—his blood and the blood of his descendants.”
The Qur'an recounts the story of Adam's two sons (Cain and Abel / Qabil and Habil), where one offers an acceptable sacrifice and the other murders him in envy, followed by a raven showing him how to hide the corpse.
“And recite unto them the story of the two sons of Adam with truth, when they offered each a sacrifice, and it was accepted from the one of them and was not accepted from the other... But the (other's) mind facilitated to him the murder of his brother, so he murdered him and became one of the losers. Then Allah sent a raven scratching up the ground, to show him how to hide his brother's naked corpse.”