Who knows sixty-three?
Please cite/link your sources, if possible. At some point in the next few days, I will:
Upvote all interesting answers.
Accept the best answer.
Go on to the next number.
1) The number of pages in Tractate Berachos (in the Vilna edition, at least).
2) Yaakov was 63 years old when he received the berachos from Yitzchak. (Megillah 17a)
3) The excess of a Se'ah Tzipporis over the Se'ah Midbaris is the volume of 63 eggs. [Se'ah Midbaris = 144 eggs; Se'ah Yerushalmis is 20% more, and Se'ah Tzipporis is 20% more than that, which equals approximately 207; and 207-144=63.] (Eruvin 83a)
4) There is a form of the Shem Hashem that has a gematria value of 63 (not that I understand anything about it...)