Do Jews fast on Passover?
With the exception of abstaining from leavened grains, on Passover — as on many Jewish holidays — it is customary to eat large festive meals. Fasting would be inconsistent with the joyous spirit of the holiday.
However there is a fast day that falls on the eve of Passover. It is the only fast day in the Jewish calendar that applies solely to one segment of the Jewish community.
The Fast of the First Born — Ta’anit Bechorot or Ta’anit Bechorim in Hebrew — is a sunrise to sunset fast observed on the eve of Passover only by first-born males. The fast commemorates the miracle which spared the first-born sons of Israel from the plague that killed the first-born sons of the Egyptians.
There is a widespread practice to hold a siyyum early in the morning on the day of the fast. A siyyum is a celebration held to mark the completion of some portion of Torah study. Because it is forbidden to fast on happy occasions, those who would normally be obligated to fast are exempted if they participate in a siyyum.
For more information on Passover customs, click here.