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Time as a Spiral

@PixelArtDragon asked what rabbi originated the idea that time is a spiral. @PixelArtDragon said that the earliest they've found is Rav Natan Breslov who lived from 1780-1844 - can anyone locate that ...
3
votes
0answers
34 views

When were the decrees against the boys made?

In Parshat Sh'mot (Ex 1:15) Par'oh decrees that the boy children of the Hebrews should be killed. When was that moment in relation to the timeline of events in Egypt (the death of Yosef, the ...
2
votes
1answer
178 views

source in seder olam of date of dor haflaga

Where in the sefer seder olam does it say the year that dor haflaga/ generation of dispersion took place?
3
votes
1answer
188 views

Sources for 3 hour time limit (not Rb. Yerucham)

The main textual source for the minhag of waiting three hours between eating meat and eating milk is Rabeinu Yerucham. However, it appears to many that the "ג" in there is actually a typo and it ...
0
votes
2answers
147 views

Waiting after meat as a minhag

I was once told in the name of R' Hamburger שליט”א that the practice of waiting between meat and milk is, for Ashkenazim, a minhag. I was told that nonetheless, as we are accustomed to wait and ...
8
votes
3answers
333 views

Rav Moshe and Giving Your Time for Charity

I recall hearing that Rav Moshe Feinstein rules that one should donate a tenth of his time to learn with other Jews, in addition to the more commonly accepted 'tithe' of money. The only source I was ...
6
votes
2answers
1k views

Blessings on Birthdays

There is apparently a practice among contemporary Jews of giving out blessings on one's birthday. Is there any source for this in the Jewish tradition?
7
votes
4answers
828 views

Concept that time is a spiral

I've heard that there is a concept in Judaism of time in a spiral, but I'm not sure where that idea originally comes from (specifically, which Rabbi originally said it). The earliest I've found is Rav ...
12
votes
1answer
398 views

Rishonim saying Ester took place during the second bayis

Elsewhere on this site, avi cited sources to the effect that, contrary to the Bavli (M'gila), the events recounted in the book of Ester took place after the second bes hamikdash was built. Do any ...
10
votes
2answers
413 views

No mitzvah to wear tefillin every day?

I heard that the Bet HaLevi and the Peri Megadim hold that there is no Mitzva for a person to don Tefilin everyday. Can someone source these opinions and explain exactly what they are meaning to say?