Zohar Pinchas, Vol. 20 (English)/Vol 15 (Hebrew)
The word Matzah, מצה, conceals the spiritual level of Chokmah and Binah that provide life for the lower levels. The letters Mem מ and צ in ‘Atbash’ אתב”ש become יה YH.
‘Atbash’ is a method of replacing the letter with its opposite position in the Hebrew Alef-Bet. The first letter א can reveal the light of the last letter ת Tav. The second letter ב Bet, reveals the second to last letter ש Shin.
The first two letters of the YHVH name are for Chokmah and Binah and that gives the Matzah a supernal power to break negativity.
The special connection of the Seder night with seven blessings of the night remove the negative aspects from the seven planets and gives Malchut the ability to draw light of Chassadim that usually appears only in the morning time. The night of the Seder is the only night during the year that we read the Halel that is usually done in the mornings of Rosh Chodesh and Holidays. The sages recommend staying up all night and study the story of Egypt and the Exodus to bridge the day before through the ‘day’ of the Seder night to experience the total revelation of the light.
That level of control gives us sustenance for the entire year. פסח, Passover is the initials of three angels of sustenance, פא”י, סא”ל, חת”ך.
The sum of the names is 610 same as מעשר, ‘Tithing’ and with the Kolel (adding one for the whole) is תורה, 611.
The process of getting out of Egypt leads the Israelites to Mount Sinai and the receiving of the Torah, the Light that sustains us in this world and prepares us for the Final Redemption and the world to come.