|Official name||Hebrew: אסרו חג
English translation: "Bind the Festival"
|Observed by||Jews in Judaism|
|Significance||Follows each of the Three Pilgrimage Festivals. Serves to bridge the respective holidays to the rest of the year.|
|Begins||The night immediately following the Three Pilgrimage Festivals|
|Ends||At nightfall of the day following the Three Pilgrimage Festivals|
|Observances||Minor: Most omit Tachanun from Shacharit and Mincha, and some partake of extra food and drink.|
The phrase originates from the verse in Psalms 118:27, which states, “Bind the festival offering with cords to the corners of the altar.” This verse, according to the Sages of the Talmud, should homiletically be understood to mean “Whosoever makes an addition to the Festival by eating and drinking is regarded by Scripture as though he had built an altar and offered thereon a sacrifice.”
In a responsum to a community that had inquired as to the rationale behind the observance of Isru Chag, Rabbi Yosef Hayyim (1832 - 1909), know as the Ben Ish Chai, cited the famous Kabbalist Rabbi Isaac Luria (1534 - 1572), known as the ARI, to the effect that we [Jews] connect the day after the holiday to the holiday itself due to the remaining “light” of the holiday – in other words, so that the sanctity of the holiday will be extended.
Adding a degree of festivity to the day as a practice has further been codified in Ashkenazic communities, as Rabbi Moses Isserles (1520 - 1572), known as the Rema, has stated in his glosses (i.e. "additional notations") in the Shulchan Aruch ("Code of Jewish Law) in the section of Orach Chayim:
- “And we have the custom to eat and drink a little more on the day after the holiday - and that is the day known as "bind the festival."”
Rabbi Yisrael Meir Kagan (1838 - 1933), known as the Chofetz Chaim ruled that the minhag ("custom") [among religiously observant Jews] is to generally forbid fasting on Isru Chag, except in instances when as a result of great distress the community synagogue decrees it.
Almost all communities omit Tachanun (additional prayers of supplication) on Isru Chag. However, communities that follow the rulings of Maimonides (1135 - 1204), such as the Dor Daim (a movement founded in 19th century Yemen), maintain that the only days on which Tachanun is to be omitted are Shabbat, Yom Tov, Rosh HaShanah, Rosh Chodesh, Chanukah, Purim, and the Mincha on the eve of any Shabbat and Yom Tov.
See also 
- Chol HaMoed, the intermediate days of Passover and Sukkot.
- Mimouna, a traditional North African Jewish celebration held the day after Passover.
- Pesach Sheni, is exactly one month after 14 Nisan.
- Purim Katan is when during a Jewish leap year Purim is celebrated during Adar II so that the 14th of Adar I is then called Purim Katan.
- Shushan Purim falls on Adar 15 and is the day on which Jews in Jerusalem celebrate Purim.
- Yom Kippur Katan is a practice observed by some Jews on the day preceding each Rosh Chodesh or New-Moon Day.
- Yom tov sheni shel galuyot refers to the observance of an extra day of Jewish holidays outside of the land of Israel.
- What is Isru Chag?
- "Holiday Wrapping"
- Isru Chag
- The Morning After
- Understanding Isru Chag and Yemei Tashlumin
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