Moses Hayyim Luzzatto, TQT”W Tefillot, § 17, pp. 17-18.

Jewish Mysticism
Your light shines from the source of all, and this is the yod that goes down vigorously, concerning which it says, “God said, ‘Let there be light,’ and there was light” (Gen. 1-3), and these are the five lights. This light emanated in the five configurations, which are the totality of holiness, and through them all the blemishes are removed so that all will be established in Your unity. This is the he’, and immediately everything is bound in one river, and this is the righteous one (saddiq) who stands on behalf of Israel, and concerning him [it says] “A river issues forth from Eden to water the garden” (ibid., 2-10), and this is the waw, and it spreads forth through Israel, which consists of the four divisions, the four camps of the Shekhinah, and when the righteous stands amongst them, the he’ is completed through them, and this is the perfection of Your holy name. … As soon as the righteous one stands in Israel, all evil is removed from them.

Translated by Elliot Wolfson in “Tiqqun ha-Shekhinah- Redemption and the Overcoming of Gender Dimorphism in the Messianic Kabbalah of Moses Hayyim Luzzatto,” History of Religions 36 (1997) 289-332.