303. Come and see: The first subject of the Torah we give to children is the Alphabet. This is a matter that mankind cannot comprehend, nor can it rise in their minds, not to mention saying it with their mouths. Even supernal angels and the most sublime cannot comprehend it, as these matters are the mysteries of the Holy Name. There are 14,050,000 worlds dependent upon the stroke of the Aleph א, MEANING THE STROKE OF THE UPPER YUD OF THE ALEPH, and 72 holy names are engraved in the impressed letters in them. The high and low beings; heaven, earth and the seat of glory of the King - are hanging from one side to the other side, MEANING FROM THE UPPER STROKE TO THE LOWER STROKE of the expansion of the Aleph. They sustain all the worlds and are the supports of the upper and lower beings within the secret of wisdom.
388. Seven complete weeks, MEANING SEVEN SFIROT OF MALCHUT THAT IS CALLED SHABBAT, WHEN THEY ARE COMPLETED, are expressed by seventy letters OF THE NAME OF AYIN-BET (72). THE MAIN BODY IS SEVENTY, AND TWO EXTRA ARE THE SECRET OF WITNESSES OR SCRIBES. HE EXPLAINS HIS WORDS: When the 72 ascended, they ascended by the letters Vav, DENOTING ZEIR ANPIN, IN ITS CHESED, GVURAH AND TIFERET, which are listed in the portion of Beshalach in the verses, "And the angel...removed...and it came... And Moses stretched out" (Shemot 14:19-21). When the Shechinah receives FROM ZEIR ANPIN and the seven impressions are stamped on Her BY HIM, NAMELY SEVEN COMPLETE SFIROT, THEN seventy imprinted letters OF THE NAME AYIN-BET rise from Her. We have learned that the letters OF THE NAME AYIN-BET ascended through certain marks and hidden ways KNOWN only to truly righteous men, pillars of the world.
404. We have learned that in the secrets of defilement, the filth of the nails stirs other filth, MEANING THE FILTH OF THE SERPENT. For this reason, it is necessary to hide them. One who eradicates them entirely, BY BURNING THEM, is considered as having awakened Chesed in the world. We have learned that man does not need to leave a memorial for those evil kinds. As we have learned, 1,405 bad types are caught up in the filth that the mighty serpent spews. All are roused by that filth in the nails.