'As Above, So Below' comes from the Judeo/Christian Star of David and the Bible

Now called The Star of David...the symbol is two interlocking isoceles (equal-sided) triangles. Each triangle represents the trinity, one triangle is the spiritual, the other is the material. The symbol means, simply 'as above, so below - the spiritual realm is mirrored by the material'. Westerners say on earth as it is in heaven. They are interlocked because they are connected in reality, yet still separate aspects of life.

- The Star of David or, Seal of Solomon, Jose Sinclair, The Bible Decoded