Have laid the foundation. Zerubbabel had commenced the rebuilding in the second year of the return, in the second month (Ezra 3:8); it had been hindered by the opposition of the neighbouring people (Ezra 4:1-5, Ezra 4:24), and was not resumed till the second year of Darius.
Shall finish it. The temple was finished in Darius's sixth year (Ezra 6:15). Thou shalt know, etc. The truth of the angel's mission would be proved by the event, viz. the successful issue (comp. Zechariah 2:9, Zechariah 2:11; Zechariah 6:15; Deuteronomy 18:22).
The completion of the material temple was a pledge of the establishment of the spiritual temple, the Church of God.