Adam Kadmon (Kabbalah)

The first world that receives from Ein Sof. It is also called “one line,” extending immediately after the constriction (tzimtzum) from Ein Sof until near this world. The name “Adam” refers only to the sefirot of the straight line in the first world, which is the light of the ruaḥ, meaning the light of giving, not its circular sefirot, which contain only the light of nefesh, meaning the light of receiving for themselves, without the ability to give to others. This is the root of man (“Adam”) in this world (Talmud Eser Sefirot, v. 2, Q & A 1).