“וַיִּפֹּל אַבְרָהָם עַל-פָּנָיו, וַיִּצְחָק; וַיֹּאמֶר בְּלִבּוֹ, הַלְּבֶן מֵאָה-שָׁנָה יִוָּלֵד, וְאִם-שָׂרָה, הֲבַת-תִּשְׁעִים שָׁנָה תֵּלֵד”
“Then Abraham fell on his face and laughed, and said in his heart, “Will a child be born to a man one hundred years old? And will Sarah, who is ninety years old, bear a child?””
The 42 letters that the world was created with (the Ana B’Koach) were revealed through the level of Binah, that is represented by the letter ה H of the YHVH name. ה is numerically 5 but since it is on the level of Binah, the Zohar considers it as 50 and together with the 42 letters we have 92.
The Zohar reveals that Sarah was the aspect of the upper Mother, Binah. When we add the two channels that the light of Binah spread out to the lower level we come to the number 92. With the aspect of Yessod that is the eighth level (counting from above) and the aspect of the circumcision on the eighth day that corrects the level of Yessod. Together we have the number 100 that represents completion.
ה this letter is for Binah that bring out the Creative force of the 42 letters.
ריו is numerically 216 that is the number of letters in the 72 names. This is the force that manifests the creative force of the 42 in the lower levels.
ן – The final letter is numerically 50, for the five Sefirot of the vessel that are held together by Yessod, that is also called כל, ‘all’ numerically 50.
The light comes down through the 9 Sefirot before manifesting a new creation in Malchut. That is the aspect of the nine month of pregnancy. The numerical value of the word הריון itself is 271 that is also the number of days in complete pregnancy.