Leviticus 11:10
10 But anything in the seas or the rivers that does not have fins and scales, of the swarming creatures in the waters and of the living creatures that are in the waters, is bdetestable to you.
Leviticus 22:5
5 and hwhoever touches a swarming thing by which he may be made unclean or ia person from whom he may take uncleanness, whatever his uncleanness may be—