John Gill Commentary Ezekiel 43:12

"This is the law of the house: upon the top of the mountain the whole limit thereof round about shall be most holy. Behold, this is the law of the house." — Ezekiel 43:12 (ASV)

This is the law of the house Which follows, the more general one, which comprehends the rest: upon the top of the mountain; denoting the exaltation and visibility of the church of Christ in the latter day, as well as its firmness and stability; see (Isaiah 2:2Isaiah 2:3): the whole limit thereof round about shall be most holy; all belonging to it shall be as the most holy place in the temple, sacred to the Lord; laws, ordinances, doctrines, worship, members, ministers, all holy; nothing said or done, or have a place here, but what is holy; see (Zechariah 14:20Zechariah 14:21): this is the law of the house; the principal one, according to which are directed and governed.