Leviticus 11:7 declares pigs unclean—the very animals the demons enter here, highlighting their unclean nature.

In 1 Kings 22:22, a lying spirit receives divine permission — like these demons, who must ask Jesus for leave to enter the pigs.

Job 1:12 shows Satan limited by God's permission — similarly, the demons here cannot act without Jesus' consent.

Job 2:6 again shows God setting boundaries on Satan — the demons here also only go as far as Jesus allows.

Matthew 8:30-33 is the parallel account—the herd of pigs and demons entering them, then rushing into the sea.

Mark 5:11-13 is the parallel account—the herd of pigs and demons entering them, then drowning in the sea.

Isaiah 65:4 condemns eating swine's flesh—pigs here symbolize uncleanness, consistent with the demonic context.