God’s Law identifies certain animals like swine, shrimp and catfish as unclean, unfit for our consumption, but most Christians ignore His instruction here, thinking these dietary laws aren’t for us today.
A key text is Acts 10, where Peter was admonished for refusing to eat certain animals God had cleansed, but which Peter identified as “common.” (Ac 10:14)
Peter was looking at a sheet swarming with all kinds of animals, apparently including some clean ones (Ac 10:12), and evidently concluding that even the clean ones were unfit to eat due to being in close contact with the others.
God was teaching Peter that engaging with those who aren’t Jewish wouldn’t defile him, which was a Jewish teaching (Ac 10:28) hindering the spread of the gospel. (Ac 11:19) The Jewish disciples never understood from this that God had changed the dietary laws, and continued keeping them faithfully. (Act 21:20)
Every creature which God has set apart for human consumption is clearly identified in His Law (1Ti 4:4), and He’s told us to consider the rest an abomination. (Le 11:12) Thankfully, God is faithful, and He doesn’t change. (Ja 1:17)