Kabbalah Yesaya 46:4: Sha'arei Orah

Now, this Sefirah is called the White Head-Rosh HaLavan-ראש הלבן. The reason is because this Sefirah is the secret of the world of great mercies and desire, and it whitens the sins of the Jewish people when His countenance of desire and mercy is revealed. I will hint at the matter further by stating, the primary color of all the colors is white-Loven-לובן, whereas the final color of all colors is black-Shachroot-שחרות. This Sefirah is the ultimate whiteness-Loven-לובן, and there is another place, outside the camp, which is the ultimate blackness-Shachroot-שחרות. The sign for this is [in the words of Havdalah], “Who separates between the holy-Kodesh-קודש and the mundane-Chol-חול, between light-Ohr-אור and darkness-Choshech-חושך.” It all is hinted in the verse,³⁶²Isaiah 46:4 “Until old age-Ziknah-זקנה, I-Anee-אני remain He-Hoo-הוא, and until [your] hoary years I will carry [you],” and,³⁶³Leviticus 19:32 “You shall rise in the presence of the elderly-Seivah-שיבה and you shall honor the presence of an elder-Zaken-זקן.”