even They must also immerse their bodies (Mekhilta; Ramban; Chizzkuni; cf. Leviticus 17:16). See Exodus 19:14. Along with circumcision (Exodus 12:48), this was part of the conversion process through which the Israelites entered the covenant of the Torah (Yevamoth 46b).
immerse In Torah law, 'washing' always denotes immersion in a mikvah or other natural body of water (cf. 2 Kings 5:10,14).
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