Miriam, the sister of Moses, passed away at the age of 126 on the 10th of Nissan of the year 2487 from creation (1274 BCE) -- 39 years after the Exodus and exactly one year before the Children of Israel entered the Holy Land. It is in deference to her passing that the "Great Shabbat" is commemorated on the Shabbat before Passover rather than the calendar date of the miracle's occurence, Nissan 10.
Link: About Miriam.
Three days after the two spies dispatched by Joshua scouted the city of Jericho (see entry for "Nissan 7" above), the children of Israel were ready to enter the land promised by G-d to their ancestors as their eternal heritage. As they approached the Jordan with the Holy Ark carried by the Kohanim (priests) in their lead, the river parted for them, as the waters of the Red Sea had split when their fathers and mothers marched out of Egypt 40 years earlier. (Joshua 4)
In today's "Nasi" reading (see "Nasi of the Day" in Nissan 1), we read of the gift bought by the nasi of the tribe of Dan, Achiezer ben Amishadai, for the inauguration of the Mishkan.
On Purim, it’s a mitzvah to hear the story of Esther read from a scroll—called a “megillah”—both by day and by night.
The Talmud tells us, “If you read the story backwards, you haven’t read the story.” (Megillah 2a.)
Of course, that means you have to read the story in the order it’s written.
But the Baal Shem Tov provided a deeper meaning:
If you read the story of Esther and of her people, of the rise of Haman and his own self-destruction, of secret heroes and hidden miracles…
…if you read all this as though it was all a backstory —something that occurred a long time ago and now provides only historical context —you haven’t read the story.
Because Jews have never had the luxury to retell this story as something we have put behind us.
Haman persists to reappear in his many incarnations, as a dictator, as a terrorist, as an ideology, as an advocate of war, as an advocate of peace, or, most pernicious of all, as the cold apathy that chills our own hearts from within.
He remains to remind us that as a nation, as well as individuals, we rely every day on G-d's miracles simply to remain the nation we were chosen to be. And when we stand firm and united, we see those miracles.
A Jew looks around and discovers: We are standing in the middle of the story of Purim right now.