For, behold, I will shake mine hand upon them, and they shall be a spoil to their servants: and ye shall know that the LORD of hosts hath sent me.
For, behold, I will shake mine hand upon them. A mere waive of God's hand can prostrate all foes (cf. Ruth 1:13; Job 20:13; Job 20:21; Isaiah 11:15; Isaiah 19:16; Acts 13:11).
And they shall be a spoil to their servants - to the Jews, whom they had once as their slaves (cf. Isaiah 14:2). Since the Jews' state between the return from Babylon and Christ's coming was chequered with much adversity, this prophecy can only have its fulfillment under Christ.
And ye shall know that the Lord of hosts hath sent me. Messiah, sanctified and sent by God the Father into the world, is the true Prophet, the Antitype to Zechariah and all the prophets (Isaiah 48:16; Isaiah 61:1; John 10:36).