From "The Lesser Holy Assembly", Chapter VII:
"293. And when all things are comprehended ..., they are called by that name of Father, Mother, and Son.
"294. And these are ChKMH, Wisdom, Father; BINH, Understanding, Mother; and DOTh, Daath, Knowledge.
"295. Since that Son assumeth the symbols of His Father and of His Mother, and is called DOTh, Daath, Knowledge, since He is the testimony of Them both.
"296. And that Son is called the first-born ...
"297. And since He is called first-born, therefore it implieth dual offspring *."
And again, Chapter XXII:
"734. The Male * is extended in right and left, through the inheritance which he receiveth (i.e., from Chokmah and Binah).
"735. But whensoever the colours are mingled together then He is called Tiphereth, and the whole body is formed into a tree (the Autz Ha-Chaiim, or Tree of Life) ..."
...
"737. His arms are right and left. In the right arm is Chesed and Life; in the left is Geburah and Death.
"738. Through Daath are His inner parts formed, and they fill the Assemblies and Conclaves, as we have said."