is. Supply "will be".
Upon, &c. Compare Ezekiel 40:2; Ezekiel 42:20; Psalms 93:5.Joel 3:17; Zechariah 14:20; Zechariah 14:21.Revelation 21:27.
most holy. the holy of holies,
holy. See note on Exodus 3:5.
Behold. Figure of speech Asterismos (App-6), for emphasis.