The Scofield Bible Commentary, by Cyrus Ingerson Scofield, [1917], at sacred-texts.com
burden
(See Scofield) - (Isa 13:1), note 1.
because of him
There seems to be a reference here to the advance and return of Alexander (Zac 9:13) after the battle of Issus, who subdued the cities mentioned in (Zac 9:1-6); and afterward returned to Greece without harming Jerusalem. But the greater meaning converges on the yet future last days
(See Scofield) - (Act 2:17)
as the last clause of verse (Zac 9:8) shows, for many oppressors have passed through Jerusalem since the days of Alexander.
behold, thy King
The events following this manifestation of Christ as King are recorded in the Gospels. The real faith of the multitude who cried, "Hosanna" is given in (Mat 21:11) and so little was Jesus deceived by His apparent reception as King, that He wept over Jerusalem and announced its impending destruction (fulfilled A.D. 70; (Luk 19:38-44). The same multitude soon cried, "Crucify Him."
And I will cut off
Having introduced the King in (Zac 9:9); (Zac 9:10) and the verses which follow look forward to the end-time and kingdom. Except in verse 9 (Zac 9:9), this present age is not seen in Zechariah.
prisoners
Compare (Isa 24:17-23); (Zac 9:21); (Zac 9:23) fix the time as the day of the LORD. (Rev 19:11-21).
strong hold