Separation

sep-a-ra’-shun: In the Pentateuch the word niddah specially points to a state of ceremonial uncleanness (Le 12:2,5; 15:20 ff; Nu 6:4 ff; 12:13; 19:21). For a description of the "water of purification," used for cleansing what was ceremonially unclean (Nu 19), see Red Heifer; Uncleanness. For "separation" in the sense of nezer, see Nazirite.