Kabbalah su Isaia 50:4

Vav is also the nose adorning the face, of which it is written (Genesis 2:7) "The Lord God created (Vayiitzer)", shining white and red. This nose going on the straight path is the nose of truth, for were it not on the true path it would be not be a seal of the King. Therefore, the image of the Queen has the nose straight on her face, where the two nostrils are the two true prophets. The mouth is the daughter of the Queen, and in it is the tongue of erudition (cf. Isaiah 50:4), which is Righteousness, of which is written (Song of Songs 4:3) "Your lips are a thread of scarlet, Your mouth is lovely -" in Torah. The mouth is the totality of all: it contains sound and speech, which are [the divine letter] Vav and Hei, and it contains breath, which is Hei, and the still, small mouth is Yud. [Therefore, the mouth is] adorned with the divine name, and this is the meaning of "Your lips are a thread of scarlet, Your mouth is lovely."