Mark 5:11 is a synoptic parallel, describing the same herd of swine feeding on the hillside.

Luke 8:32 is another synoptic parallel, with the same detail of a large herd of swine.

Leviticus 11:7 declares pigs unclean — the animals the demons entered, emphasizing impurity.

Deuteronomy 14:8 also prohibits eating pigs, reinforcing the unclean status of the swine herd.

Isaiah 65:4 condemns eating pig's flesh, linking swine with abomination — the same animals in the herd.

Luke 15:15 shows feeding pigs as degrading, reflecting the lowly status of swine in Jewish culture.