806. This was the commandment of the Holy One, blessed be He, to Moses, "And you shall make boards for the Tabernacle of acacia wood standing up" (Shemot 26:15). It is written, "Seraphim stood above Him, each one had six wings... " (Yeshayah 6:2). For the construction of the Tabernacle with these boards resembled these Seraphim. The ones were standing and the others were standing.
807. If you say that all the hosts of heaven stand, as it is written, "Then I will give you access among these who stand by" (Zecharyah 3:7) and "all the host of heaven standing by Him... " (I Melachim 22:19). Do all the supernal camps have no joints, NAMELY KNEES TO KNEEL AND SIT, so they all stand? HE ANSWERS, Surely they all stand. They are sometimes called 'Seraphim' and sometimes with a different name, but these IN THE VERSE "SERAPHIM STOOD ABOVE HIM" always bear the same name, SERAPHIM. AND THE COMPARISON OF THE BOARDS OF THE TABERNACLE TO SERAPHIM IS TRUE WITH ALL THE SUPERNAL ANGELS, BECAUSE THEY ARE ALL REFERRED TO AS SERAPHIM OCCASIONALLY BUT THEY ARE NOT EXACTLY LIKE THE SERAPHIM IN THE VERSE, "SERAPHIM STOOD ABOVE HIM... "