New Defender's Study Bible Notes
7:1 king Darius. Two years after Zechariah was given the eight visions, he received another word from God, this time rebuking the Jews still in Babylon for instituting a formal fast day without authorization from God and without true repentance. Like many modern religionists, “they made their hearts as an adamant stone” (Zechariah 7:12) whenever they heard God’s Word.
7:2 house of God. Possibly this delegation came from Bethel (which means “House of God”). Elsewhere in the Old Testament, the temple is always spoken of as “the house of the LORD.” The delegation wanted to know if they should continue to mourn and fast in commemoration of the temple’s destruction, now that it was being rebuilt.
7:5 did ye at all fast unto me? This was a rhetorical question. The fact that they asked it indicated that these fasts were a burden to them. As a matter of fact, the Lord had never commanded them in the first place. The only regular fast specified by God was that on the Day of Atonement (Leviticus 23:26-32).
7:12 adamant stone. See note on Ezekiel 3:9. The Hebrew word for “adamant” basically means “pricking” and is often translated “briers.” When used in connection with a stone, however, it means a “pricking” stone, one which can engrave metals or glass. It is translated “diamond” in Jeremiah 17:1.