In Zechariah, Jesus is the Firstborn Son over whom they will Grieve and Mourn

“And I will pour on the house of David and on the inhabitants of Jerusalem the Spirit of grace and supplication; then they will look on Me whom they pierced. Yes, they will mourn for Him as one mourns for his only son, and grieve for Him as one grieves for a firstborn.” Zech. 12:10
This is a prophecy that was fulfilled in small measure at the time of the early church when thousands of Jews, many of whom had called for Jesus’ crucifixion, later repented and recognized they were guilty of murdering the Messiah. But a greater fulfillment awaits. God promises to pour out a Spirit of grace and supplication on them. Because of His grace (unmerited favour) they will cry out to Him (supplication). God refers to Himself as the One pierced. This refers to the deity of Jesus. He was pierced on the cross, both in His hands and feet, and the spear in His side.

This was foretold centuries earlier in Psalm 22, a Messianic psalm.
“For dogs have surrounded Me;
The congregation of the wicked has enclosed Me.
They pierced My hands and My feet;
I can count all My bones.
They look and stare at Me.
They divide My garments among them,
And for My clothing they cast lots.” Psalm 22:16-18
It’s important to remember that when this Psalm was written, the practice of crucifixion was completely unknown.
The result of their recognition of guilt for the death of the son of God will be to grieve and mourn. This confirms that this piercing resulted in death. The grief will be of the worst kind; mourning as for an only son, and grieving as for a firstborn. And Jesus is God’s only begotten Son, and He is the firstborn, both literally, and in status. He is also called the firstborn from the dead, relating to His resurrection.
This is a promise of salvation to a remnant of Jews. In the book of Revelation there is a similar recognition of who Jesus is, but it comes too late.
“Behold, He is coming with clouds, and every eye will see Him, even they who pierced Him. And all the tribes of the earth will mourn because of Him. Even so, Amen.” Rev. 1:7

Tags: Crucifixion, firstborn son, Jesus, mourn