May I tie a knot at the end of my tzizis,
after all it is not a double knot?
In the previous
Shabbos sheet we mentioned that the poskim hold that a strong double knot is
classified as a craftsmans knot due to its sturdiness and strength; hence one may
not tie a double knot even for less than 24 hours.
On the other hand, a
single knot is not classified as a knot at all and may be tied for an unlimited time.
However, one must be careful to know which knot the halacha considers a single knot
before tying any seemingly innocent knots.
single knot is the knot beneath the bow on ones shoe (without the bow). Such
a knot cannot last at all and is not strong. For example, tying two handles of a plastic
bag in the same manner as the knot on a shoe (we are not referring the knot where the two
handles are twisted into one and tied, that comes later). Since this is only a single knot
and if one were to apply any pressure to the bag the knot would open.
that when necessary, for the sake of a mitzvah, one is permitted to tie a knot that
would normally be forbidden midrabanan. This is not a blanket heter
because the Magen Avraham says that this is on
condition that a normal permitted knot would not suffice.
For example, one may
tie a rope to fence off a hole in the ground to prevent people from getting hurt. Tying a
slipknot or a bow, which are permitted knots, would not suffice as it leaves potential
danger; rather one is permitted to tie a craftsmans knot with the intention of
leaving it tied for a short time. Such a knot is normally ossur midrabanan,
but to facilitate for a mitzvah Chazal permitted it.
If the answer to the above is yes, is there a restriction as to which
type he may tie and which knot not?
One may not tie a
knot which is forbidden midoraisso (a Biblical prohibition) even for the sake
of a mitzvah. Therefore a permanent double knot or any other craftsmans knot
is forbidden under all circumstances.
explains the matter saying that one does not look at the individuals intention
rather at the global manner of tying those particular knots. Since knots tied in tzizis
are always permanently tied, it would not help deciding or intending to untie them
after Shabbos and they remain knot that are biblically forbidden to tie on Shabbos.
Therefore there is no option on Shabbos but to remain without tzizis on that