In Zechariah 14:21, the day described in verse 1 culminates in total holiness — no trader in the temple, all pots holy.

Zechariah 13:8 describes two-thirds cut off in the land — preceding the day of the Lord and spoil division in the next chapter.

Isaiah 2:12 proclaims the day of the LORD against the proud — same theme as Zechariah 14:1's coming day of judgment.

Isaiah 13:6 announces the day of the LORD as destruction — a parallel prophecy of judgment to Zechariah 14:1.

In Isaiah 13:9, the same phrase 'day of the LORD' describes a coming judgment with wrath and destruction, reinforcing Zechariah's theme.

Joel 2:31 adds cosmic signs (sun to darkness, moon to blood) that precede the day of the LORD, expanding the prophetic imagery.

Revelation 16:14 describes demonic spirits gathering kings for battle on 'the great day of God', echoing the end-time battle theme.

Isaiah 13:4 depicts the Lord mustering an army for battle on the day of the Lord — the same gathering of nations here.

Jeremiah 30:7 calls that day unparalleled and a time of distress for Jacob — echoing the unique day of judgment here.

Ezekiel 38:17 recalls prophecy of a future invasion — matching the gathering of nations against Jerusalem here.

Malachi 4:1 echoes the same 'day of the LORD' imagery — a burning judgment that consumes the wicked.

Luke 21:22 calls the coming judgment 'days of vengeance' that fulfill Scripture — directly linking to the 'day of the LORD' in Zechariah 14:1.

Peter quotes Joel 2:31 in Acts 2:20, applying the day of the LORD imagery to Pentecost, linking OT prophecy to NT fulfillment.

Malachi 4:5 connects the day of the LORD with the coming of Elijah, adding a forerunner figure not mentioned in Zechariah.

Joel 3:14 locates the day of the LORD in the 'valley of decision', emphasizing the gathering of nations for judgment.