The gemara says that in this world the name of Hashem י-ה-ו-ה is pronounced as if it were spelled אדנ-י. The name י-ה-ו-ה represents Divine essence and transcendence. On the other hand, אדנ-י, represents Hashem’s immanence, sovereignty, and how He manifests within this world. Their combination represents the unification of Divine transcendence and immanence, Heaven and Earth, or spiritual potential and earthly expression.
Now, a malach is a messenger or intermediary between realms: From Hashem to people, or from the upper worlds to lower ones. Thus, a malach is the bridge or conduit through which the higher name (י-ה-ו-ה) is manifested in the lower world (אדנ-י). It embodies the connection between the spiritual source and its revealed form.
A malach is not just a being—it is a unification of these two names of Hashem, representing its Divine mission. Consequently, it comes as no surprise that the word מלאך has a gematria of 91, the same as Hashem’s name י-ה-ו-ה (26) and אדנ-י (65)!
R' Shimshon Miostripoliya teaches that the yam suf split via the use of the names of Hashem י-ה-ו-ה and אדנ-י. He shows a fascinating allusion to this in the pasuk וְאַתָּה הָּרֵם אֶת־מַטְךָ וּנְטֵה אֶת־יָּדְךָ עַל־הַיָּם וּבְקָּעֵהוּ, and you, lift up your staff and stretch out your arm over the sea and split it (Shemos 14:16): If we lift (הרם) the letters that comprise the word מטך, we get the letters נ,י,ל (above a מ which has a gematria of 40 is נ, 50; above a ט, 9 is י, 10; above a כ, 20 is ל, 30). Next, we take the words ונטה את ידך literally and go to the letters under (נטה) those that comprise ידך. We therefore get ט,ג,י (below a י,10 is ט, 9; under ד, 4 is ג, 3; under כ, 20 is י, 10). Next, we take the words על הים literally and go to the letters above ים. We then get כ,נ (on top of י, 10 is כ, 20; over מ, 40 is נ, 50). If we now take the total sum of all these letters—נ,י,ל,ט,ג,י,כ,נ—we get 182. Now, the next word in the pasuk is ובקעהו, split it. So split the number 182 in half and we get 91. 91 is the collective gematria of י-ה-ו-ה and אדנ-י!
