Zechariah 12:10 me whom they have pierced

Zechariah 12:10 (KJV) And I will pour upon the house of David, and upon the inhabitants of Jerusalem, the spirit of grace and of supplications: and they shall look upon me whom they have pierced, and they shall mourn for him, as one mourneth for his only son, and shall be in bitterness for him, as one that is in bitterness for his firstborn.

First thing to say is this verse makes no sense as translated above. In the first person it says "look upon ME whom they have pierced, and they shall mourn for HIM".

Why would this be Jesus saying they pierced ME, and then say they will mourn for HIM? Who is the HIM in that case? It's incoherent.

That's why many translations go for the below which is allowed by the hebrew grammar.

New American Bible
"so that when they look on HIM whom they have thrust through, they will mourn for HIM"

New Revised Standard Version
"so that, when they look on THE ONE WHOM they have pierced, they shall mourn for HIM"

JPS Tanakh 1917
"And they shall look unto Me because they have thrust him through; And they shall mourn for him,"

(This one above is my personal preferred translation)

Good News Translation
"They will look at the ONE WHOM they stabbed to death, and they will mourn for HIM"

Contemporary English Version
"when they see the one they pierced with a spear. They will mourn and weep for him"

Secondly, we are specifically told that God spoke through the prophets in the old days.... NOT the son. The son speaks only in these "last days".

Hebrews 1:1-2 (KJV) God, who at sundry times and in divers manners spake in time past unto the fathers by the prophets,
Hath in these last days spoken unto us by his Son...

Thirdly, every Bible Translation out there has John quoting the Zechariah verse as below with "HIM whom they have pierced" or something very similar. This is confirmation that the unpopular translation of Zech 12:10 is the correct one.

John 19:37 (KJV) And again another scripture saith, They shall look on HIM whom they pierced.

So in Zechariah 12:10 it is most certainly not Jesus talking, it is Yahweh. For conclusive proof, see where the speaker goes on to talk about "my shepherd" in the same passage. Jesus doesn't have a shepherd, he is the shepherd. God's shepherd.