There seems to be a lot of different ways to tie tzitzit knots. From the little I understand this is based on various symolism and numeric value (see this question/answer). I would like to know what ...
The gemara in nazir learns that an unspecified nezirut is 30 days long from the pasuk "kadosh yihyeh" with yihyeh having gematria 30. Can anyone think of other places where halachot are learned from ...