זוהר שמות — דף רכא ע”ב

Eleh pekudei haMishkan — and the secret within it. When the tabernacle was being made, the Other Side wandered about to accuse, finding no foothold against the faithfulness of the craftsmen, until the Holy One, blessed be He, bent it before Moses, who made the accounting of fidelity against its will. The Mishkan haEdut carries the name Yah, which is the testimony of Israel. Since Moses came, this Name was restored to the world, and thus the tabernacle is called Mishkan haEdut — the dwelling of testimony.