And what would the tree be that you spoke of? He said to him: [It is] the powers/kochot of the Holy One, this on back of this, and they resemble/domin a tree: just as this tree, by means of the waters, brings out fruit, even so the Holy One by means of the waters increases the powers of the tree. And what are these waters of the Holy One? They are wisdom, and they are the souls/n’shamot of the righteous that bloom/grow/fly/por’chin from the spring unto the great channel. And he goes up and joins with the tree, and by what means does [the tree] bloom/grow? By means of Israel, [for] when they are righteous and good, Shekhinah rests among them, and through their deeds she rests in the bosom of the Holy One, and makes them fruitful and increases them.
The Bahir - Book of Illumination and Its Secrets
Sefer HaBahir 1:119