שִׁשָּׁה חֳדָשִׁים: The Six Months and Their Reasons
Each month's messengers serve a specific purpose — the reason determines the urgency and the reach of the notification
Before the fixed calendar was established, the new month was declared by the Sanhedrin based on witnesses seeing the new moon. Messengers (שְׁלוּחִין) were dispatched immediately to inform Jewish communities throughout the land and diaspora. Not all months required this — only those whose festivals or fasts depended on knowing the exact date in time to prepare.
Month 1
נִיסָן
מִפְּנֵי הַפֶּסַח
Because of Pesach — pilgrims need to know when 14 Nissan falls to plan their journey to Jerusalem in time.
Month 5
אָב
מִפְּנֵי הַתַּעֲנִית
Because of the fast — communities need to know when 9 Av falls to observe the fast on the correct day.
Month 6
אֱלוּל
מִפְּנֵי רֹאשׁ הַשָּׁנָה
Because of Rosh Hashana — communities need advance notice so they can prepare for the new year beginning 1 Tishrei.
Month 7
תִּשְׁרֵי
מִפְּנֵי תַקָּנַת הַמּוֹעֲדוֹת
Because of the regulation of the festivals — Sukkot falls on 15 Tishrei. The entire festival calendar of the 7th month depends on its correct date.
Month 9
כִּסְלֵו
מִפְּנֵי חֲנֻכָּה
Because of Chanukah — communities need to know when 25 Kislev falls to light on the correct night.
Month 12
אֲדָר
מִפְּנֵי הַפּוּרִים
Because of Purim — communities need to know when 14 Adar falls for the reading of the Megillah and celebration of Purim.
When the Temple stood, messengers also went out for Iyar — because of Pesach Katan (Pesach Sheni). The second Passover on 14 Iyar — for those who missed Pesach — required the same advance notice as the first. Once the Temple was destroyed and Pesach Sheni no longer applied, this notification ceased.
נִיסָן בְּמֶרְכָּז: Why Nissan Heads the List
Nissan is first — in the list and in the year. The Pesach pilgrimage gives it the most urgent need for timely notification
Rosh Chodesh Nissan — The Messenger's Urgency
The Deadline
י״ד נִיסָן — עֶרֶב פֶּסַח
The Korban Pesach must be slaughtered on 14 Nissan afternoon. Pilgrims from across the land — and the diaspora — must arrive in Jerusalem by that day.
The Window
מֵרֹאשׁ חֹדֶשׁ — אַרְבָּעָה עָשָׂר יוֹם
From Rosh Chodesh Nissan there are exactly 14 days until Erev Pesach. The messengers' speed determines whether distant communities can prepare and travel in time.
The Stakes
כָּרֵת — לַמְּאַחֵר
Missing the Korban Pesach without valid reason carries karet. The messenger system exists precisely so that no one misses Pesach due to not knowing the date.
The Fallback
פֶּסַח שֵׁנִי — י״ד אִיָּר
Those on a distant journey (derech rechokah) who miss Pesach may bring Pesach Sheni on 14 Iyar — hence the second set of messengers when the Temple stood.
🔗 See also: Pesachim 9:1–2 (derech rechokah) and Taanit 1:3 (pilgrimage travel calendar) — the messenger system and the pilgrimage journey are two sides of the same infrastructure that made the regel possible.
הַמַּסְקָנָה — A Calendar Built on Communication
This mishnah reveals the infrastructure beneath the Jewish calendar: knowing the date was not automatic — it required a system. Six months a year, riders left Jerusalem the moment the new moon was sanctified, carrying the news outward. The list is not random — each month is selected because a specific obligation hangs on its date, and that obligation demands enough lead time to act. Nissan heads the list because Pesach demands the most of its participants: travel, preparation, purity, and the korban itself. Rosh Chodesh Nissan is not just the start of the month — it is the starting gun for the entire Pesach enterprise.