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WHEN IS EVENING - BIBLICALLY?
The following verses illustrate when the evening of a day occurs.  In every example used
here, <even> is #6153.

Leviticus 14:46 Moreover he that goeth into the house all the while that it is shut up shall be unclean
until the even.  (br,['h'-d[;)

The Hebrew is the same for the following verses.  The bible uses this exact term 44 times.

Leviticus 15:5 And whosoever toucheth his bed shall wash his clothes, and bathe himself in water,
and be unclean
until the even.
6 And he that sitteth on any thing whereon he sat that hath the issue shall wash his clothes, and bathe
himself in water, and be unclean
until the even.
7 And he that toucheth the flesh of him that hath the issue shall wash his clothes, and bathe himself in
water, and be unclean
until the even.
8 And if he that hath the issue spit upon him that is clean; then he shall wash his clothes, and bathe
himself in water, and be unclean
until the even.

One was unclean until the even.  The evening of a day is that which follows the day, unless
of course we are speaking of “between the evenings” or the entire evening, which
includes both evenings.  It is impossible to be unclean “until the evening” of the previous
day!  The evening and "between the evenings" were next to each other.  If we were
speaking of the fourteenth at evening, it should be clear that "between the two evenings"
has to be at the end of the fourteenth rather than at the beginning of the fourteenth.

Suppose one was unclean on the fourteenth day of Nisan.  He would be unclean until
even.  In other words, he would be unclean until the beginning of the 15th.  Obviously, one
was unclean until the new day began.  How can the evening of the 14th be at its beginning,
in this example?  If one were unclean on the 13th, he would be unclean until the evening,
which would begin the 14th.  Therefore, in order to observe Passover at the beginning of
the 14th, the command would have had to tell us to keep the Passover on the 13th at
evening.