רמב"ן — ככל אשר אני מראה אותך... וכן תעשו

Q — 'ככל אשר אני מראה אותך... וכן תעשו' — what is 'וכן תעשו' adding? Rashi: a command to all generations to build the Beit HaMikdash and its kelim by these specifications. Ibn Ezra: 'וכן תעשו' refers narrowly to the kelim.

A — Ramban rejects Rashi sharply: Shlomo's mizbeach ha'nechoshet was 20x20, not Moshe's dimensions, proving no binding tavnit-for-generations is intended here. He prefers a stylistic reading: 'וכן תעשו' is repetition for חיזוק וזרוז — 'all of you, with eagerness and dispatch, build this.' It parallels the doubled formula at the project's close: 'ויעשו בני ישראל ככל אשר צוה ה' את משה כן עשו.' A command voiced twice signals not new content but heightened urgency. The chiddush is grammatical-pragmatic: doubling can mean intensity, not addition — a foundational hermeneutical principle.