Sifra di-Tzeniutaספרא דצניעותא

"The Book of Concealment" — five brief chapters of pure compressed cipher, the Zohar's densest text: creation described as the balancing of a scale, the engraving of the Name, the features of the hidden Face, all in telegraphic Aramaic without explanation. The Idras exist to unpack it. Its opening image — "Until there was a balance, face did not gaze upon face" — is the tradition's koan of relation.