The request to use blood for marking the doors came to represent the judgment that was decreed above on Egypt.
“מִי זֶה בָּא מֵאֱדוֹם חֲמוּץ בְּגָדִים מִבָּצְרָה זֶה הָדוּר בִּלְבוּשׁוֹ צֹעֶה בְּרֹב כֹּחוֹ אֲנִי מְדַבֵּר בִּצְדָקָה רַב לְהוֹשִׁיעַ.”
“Who is this who comes from Edom, with garments of glowing colors from Bozrah, This One who is majestic in His apparel, Marching in the greatness of His strength? “It is I who speak in righteousness, mighty to save.””
This verse from Isaiah’s prophecy about the time of the Final Redemption. It describes the vengeance that God will take on the other-side. ‘Edom’ ‘אדום’ is a name of an ancient kingdom. It has the same letters as the color red to represent the judgment that will take place in the future on those who are on the ‘left’ side.
“וּלְקַחְתֶּם אֲגֻדַּת אֵזוֹב, וּטְבַלְתֶּם בַּדָּם אֲשֶׁר-בַּסַּף, וְהִגַּעְתֶּם אֶל-הַמַּשְׁקוֹף וְאֶל-שְׁתֵּי הַמְּזוּזֹת, מִן-הַדָּם אֲשֶׁר בַּסָּף; וְאַתֶּם, לֹא תֵצְאוּ אִישׁ מִפֶּתַח-בֵּיתוֹ–עַד-בֹּקֶר.”
“”You shall take a bunch of hyssop and dip it in the blood which is in the basin, and apply some of the blood that is in the basin to the lintel and the two doorposts; and none of you shall go outside the door of his house until morning.”
The instruction to mark the doors came with immediate warning “and none of you shall go outside the door of his house until morning”. The Zohar explains that when there’s a judgment over a town, the ’destroyer’ has permission to execute the judgment on any person on his path. The Israelites had to stay in their protected dwellings/vessels while the judgment is executed on Egypt.
The world around us is full of negativity and the aspect of judgment is almost everywhere we go. We should avoid any situation that shows signs of judgment as if it’s a deadly plague. Avoid walking alone at night. Do not stop to see accidents, people arguing, fighting. Do not even inquire about such situations. If you come to a place that gives you some bad feelings, leave or move away quickly.
We have 248 precepts of positive actions and 365 of avoiding negativity. It teaches us that every day of the year we need to pay attention to what to avoid, even before doing good.
We protect our homes with the Mezuzah and by increasing the Light inside. Some people keep at home idols, wicca books, crystals of unknown source, ‘shortcuts’ and similar things. I strongly suggest removing anything that is not aligned with the teaching of Torah, Zohar and Kabbalah. Any object that believed to have some kind of energy/force in most cases attracts negativity. These things are from the Left/other-side and should never be in the presence of sacred text of Torah and Zohar because they would attract judgments.
The protection is pure from God and depend on our vessels. To stay away from judgment, we should purify our vessels by connecting daily to Torah and Zohar. There’s no other pure and positive way. Abraham was pure with his faith and actions of Chessed. When the evil king Nimrod threw him into a fire furnace, Abraham was protected and could walk out safely.