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"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" -- Zech. 12;10.
In the Old Testament, God is speaking of the last days when the Lord returns, and He says, "they shall look upon me whom they have pierced". God is telling us in the Old Testament that He's Jesus. And in Rev. 1;8, Jesus says He's the "Almighty".
There will come a day when the Lord will return. And everyone will know who He is. The Jews will know that He's Jesus, and the Gentiles will know that He's God (as in one in the same person).