5

Probably this, from Magen Avraham 11:18: כ' בשל"ה ומט"מ שאל יחתוך בסכין אלא ינשכם בשיניו ע"ש: Shaloh and Mateh Moshe say that you shouldn't cut [the tzitzis strings] with a knife, but bite them with your teeth; see there.


4

I heard in a shiur that wearing Tzitzit helps reduce toothaches and teeth pains This is brought in a Hirhurim blogpost on Tzitzit: It is said that being careful in the observance of the mitzva of Tzitzit is a segula for preventing tooth aches. [Kaf Hachaim 11:17]. The Kaf Hachaim (Sofer), brings it here. He, in turn, is quoting the Kaf Hachaim (Palaggi) ...


1

There could be another explanation. Rambam in Hilchos Beis Habdhira says that the Altar was not a building, but one of the tools, used in the Temple (just like the Menorah or the table). As such it is exempt from the railings because it is not a building to start with, like building a giant chair.


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