Then the priest
kohen (ko-hane')
literally, one officiating, a priest; also (by courtesy) an acting priest (although a layman) -- chief ruler, own, priest, prince, principal officer.
shall command
tsavah (tsaw-vaw')
(intensively) to constitute, enjoin -- appoint, (for-)bid, (give a) charge, (give a, give in, send with) command(-er, -ment), send a messenger, put, (set) in order.
that they wash
kabac (kaw-bas')
to trample; hence, to wash (properly, by stamping with the feet), whether literal (including the fulling process) or figurative -- fuller, wash(-ing).
the thing wherein the plague
nega` (neh'-gah)
a blow (figuratively, infliction); also (by implication) a spot (concretely, a leprous person or dress) -- plague, sore, stricken, stripe, stroke, wound.
is and he shall shut
cagar (saw-gar')
to shut up; figuratively, to surrender -- close up, deliver (up), give over (up), inclose, pure, repair, shut (in, self, out, up, up together), stop, straitly.
it up seven
sheba` (sheh'-bah)
a primitive cardinal number; seven (as the sacred full one); also (adverbially) seven times; by implication, a week; by extension, an indefinite number
days
yowm (yome)
a day (as the warm hours),
more
sheniy (shay-nee')
double, i.e. second; also adverbially, again -- again, either (of them), (an-)other, second (time).