Leviticus 11:9-12 New International Version (NIV)

⁹ “‘Of all the creatures living in the water of the seas and the streams you may eat any that have fins and scales. ¹⁰ But all creatures in the seas or streams that do not have fins and scales—whether among all the swarming things or among all the other living creatures in the water—you are to regard as unclean. ¹¹ And since you are to regard them as unclean, you must not eat their meat; you must regard their carcasses as unclean. ¹² Anything living in the water that does not have fins and scales is to be regarded as unclean by you.