Which parts of this passage contain a biblical allusion? So lived the clansmen in cheer and revel a winsome life, till one began
to fashion evils, that field of hell. Grendel this monster grim was called, march-riever mighty, in moorland living, in fen and fastness; fief of the giants the hapless wight a while had kept since the Creator his exile doomed. On kin of Cain was the killing avenged by sovran God for slaughtered Abel. Ill fared his feud, and far was he driven, for the slaughter’s sake, from sight of men. Of Cain awoke all that woful breed, Etins and elves and evil-spirits, NextReset
Things you see in the Bible are hell, Creator, Cain and Abel. I think the main allusion is the section about Cain and Able. It's a well known Bible story about a guy who kills his brother out of jealousy. (the first murder) Cain was banished from the garden of Eden for his sin.
