On the Shabbat before the Exodus--Nissan 10th on that year--the first-born of Egypt, who occupied the senior positions in the priesthood and government, fought a bloody battle with Pharaoh's troops, in an effort to secure the release of the Israelites and prevent the Plague of the Firstborn. This "great miracle" is commemorated each year on the Shabbat before Passover, which is therefore called Shabbat HaGadol, "The Great Shabbat." (This is one of the rare instances in which a commemorative date in the Jewish calendar is set by the day of the week rather than the day of the month.)
For more on the war of the Firstborn, see here.
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.
The Shabbat before Passover is termed Shabbat HaGadol ("The Great Shabbat") in commemoration of the "great miracle" that happened in Egypt on this day, heralding the Exodus from Egypt five days later (see "Today in Jewish Hstory"). Shabbat HaGadol customs include reading a portion of the Haggadah (from "Avadim hayinu..." to "...al kol avonotainu"), which tells the story of the Exodus; it is also customary that the rabbi of the community delivers a lecture in which he elaborates on the laws of Passover and their significance, in preparation for the festival.
Look deeply within each person you encounter, no matter how brilliant or dull, refined or crude, righteous or wicked you judge this person to be.
Beyond their clothes, beyond their skin, beyond their behavior, beyond their words.
Beyond the emotions they show, the personality in which they dress, past whatever masks they don to conceal their inner woes.
Look deeply and see the vicious war each one fights inside, the battle to remain human in a maddening world—a world you will never know, for no two of us are placed in the same world and no two of us confront the same challenges—
—the angst of facing those failures and deficiencies you hope no one knows, but you know they do, the yearning to be more, the disappointment at not being that, the struggle to fight every sorrow, every pain, every plummeting, disastrous trauma of life…
True, perhaps not everyone fights every battle. Some have long surrendered.
But the very fact that this person was assigned this battle tells us more than can be spoken, for the One who created him knows he has the power to prevail and win.
That alone is enough to admire, and to be humbled, asking yourself, “Do I fight a battle nearly as fierce as the one I expect this person to win? In what way am I any better?”