Devorim 19:27:
Do not cut off the hair on the sides of your head. Do not shave off the edges of your beard.
From the Arizal
taf – 400
ayin- 70
reish-200
=670 +1 [for the word itself called kollel, a traditional Kabbalistic hermeneutic]
Total =671
Ado-nai spelled: aleph dalet nun yud
Ado-nai spelled out in full
aleph spelled aleph-1 lamed-30 pei -80 = 111
nun spelled nun -50 vav -6 nun-50 = 106
yud spelled yud -10 vav -6 dalet-4 = 20
Total=671
However, you already know that the head [of a person] incorporates allusions to the ten sefirot, and that its allusion to malchut constitutes the secret of the Sides of the Head. Thus, PeAH [side] has the numerical value of the Divine name Elokim, and PeAH [side] is always in malchut.
PeAH spelled pei aleph hei
pei : 80
aleph : 1
hei : 5
Total = 86
Elo-him spelled aleph lamed hei yud mem
aleph – 1
lamed -30
hei – 5
yud -10
mem -40
Total= 86
However, there is no sustained existence to the world except through the judgments, and it is not fitting to remove them completely. To that end, we need to retain only the dimension of malchut [i.e. peah], but this applies only to the head of Zeir Anpin [man]. However, Nukva [woman] does not shave her head. The reason is that since she corresponds to Nukva, and since all the judgments are in Asiya [world of action/Nukva], were she to remove the judgments from the head of Nukva, there would not remain any judgments in the world. Accordingly, a woman needs to keep her hair, and does not shave her head.
My master was extremely careful not to get a haircut after midday, that is after the time arrives for praying the Large Mincha. Even on the eve of the Sabbath [Friday], he was cautious.
It is fitting that a man not uproot any hair from his beard at all, for the beard hairs are channels of Divine spiritual abundance. He should intend that the top of the beard is the First Tikun.
E-l, in the secret of the thirteen attributes of mercy, and the hair of the beard on the left and right is twice the numeric value of the word zakan (beard), and that is the numerical value of the Divine name Sha-dai.
Zakan spelled zayin kuf nun
kuf -100
nun -50
157 x 2= 314
Sha-dai spelled shin dalet yud
shin -300
dalet- 4
yud – 10
Total=314
Together the beard as a whole is E-l Sha-dai. For this reason a man should be mindful at all times not to grasp his beard so that he does not uproot any hair from it.
Taamei Hamitzvot, Parashat Kedoshim, pg.194