As a Jew you had to be “clean” for the Passover. What happened if you could not celebrate the Passover because you were “unclean” say by touching a dead body?

You would celebrate the Passover a month later.

Source: Numbers 9:10-11

When God passed through the land of Egypt on the first Passover the Hebrews were to make a sign indicating they were Jewish and not to have their Firstborn killed. What was that sign?

Bible Trivia Answer for Friday 04/07/2017

They were to mark their doorposts and Lintel (support across the top of the Door) with the blood of a freshly killed lamb.

Source: Exodus 12:7

Passover has diet restrictions. What common baking item did the Jews have to remove from their houses before Passover?

They had to remove all yeast or leaven from their houses. Passover is also called the feast of unleavened bread.

Source: Exodus 12:15 and several other verses.

The celebration of the feast of Passover fell into disuse as the Israel abandoned God. I reestablished the feast for a short time before the exile. Who am I?

I am Josiah King of Judah. During my reign Law of Moses was rediscovered and Passover was reinstated.

Source: 2 Kings 23:21-23, 2 Chronicles 35:1-19

The Feasts of Passover, Pentecost and Tabernacles have in something in common that was not shared with other festivals. What required action did they have in common?

What they had in common is that these feasts required all Jews to come to Jerusalem. This was a pilgrimage done throughout the Old Testament and in the time of Jesus earthly life

Source: Exodus 34 and Deuteronomy 16