Sefer HaMitzvot, Positive Commandments
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היא שצונו להיות מטמאים בשמנה שרצים, מצוה זו כוללת טומאת שרץ ומשפטיהם. (שמיני, טהרה שאר אבות הטומאה פ"ד):
Sefaria Edition 2021, Translated by Rabbi Francis Nataf
That is that He commanded us to [administer the laws of impurity] of eight creeping creatures. This commandment includes the impurity of the creeping creature and its regulations. (See Parashat Shemini; Mishneh Torah, Other Sources of Defilement 1.)