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In Scripture the requirement is to observe Passover on 14 Nissan (1-day) and Unleavened Bread on 15 Nissan through 21 Nissan (7-days). What is the basis for the 9-day period?

marked as duplicate by DonielF, Salmononius2, Yaacov Deane, sabbahillel, mbloch Apr 6 at 16:51

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    Only eight days; Jewish days go from sunset to sunset. It’s April 19 after nightfall, not the entire April 19. And Chabad there say that it’s only eight days outside of Israel. – DonielF Apr 5 at 14:48
  • In addition to what DonielF wrote, confusion can also come from the requirement not to eat or own leaven after late morning of April 19 and not to resume eating leaven until late in the evening of April 27 (usually at least 30 minutes after the end of the holiday), about 8 1/2 days. – Dennis Apr 5 at 15:43
  • @DonielF The day begins at sunset and April 19 after nightfall is 15 Nissan? – Revelation Lad Apr 5 at 16:12
  • @RevelationLad Yes. – DonielF Apr 5 at 16:13
  • @Dennis Is the "extension" to make 8 1/2 days a custom? Because from Daniel I see the period as coming to 7 "plus" days (i.e 7 1/2 but not more than 8). – Revelation Lad Apr 5 at 16:19

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