KJV : To teach <03384> (8687) when <03117> [it is] unclean <02931>, and when <03117> [it is] clean <02889>: this [is] the law <08451> of leprosy <06883>. {when it is unclean...: Heb. in the day of the unclean, and in the day of the clean}

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NASB : to teach when they are unclean and when they are clean. This is the law of leprosy.

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NASB# : to teach<3384> when<3117> they are unclean<2931> and when<3117> they are clean<2889>. This<2088> is the law<8451> of leprosy<6883>.