Leviticus 11:9-12

⁹ "Among the creatures that live in the water of the seas and streams, you may eat any that have fins and scales. ¹⁰ But anything that doesn't have fins and scales, whether in seas or streams, whether small creatures in the shallows or huge creatures in the deeps, you are to detest. ¹¹ Yes, detest them. Don't eat their meat; detest their carcasses. ¹² Anything living in the water that doesn't have fins and scales is detestable to you.