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The closing line of Psalm 22, that he hath done this, lands on Christ's finished work.
The study behind this
Psalm 22 is a cry of King David, set down roughly a thousand years before Christ. It opens in the voice of a man surrounded and abandoned, then bends, line by line, toward a suffering David himself never endured and a rescue that reaches the ends of the earth.
...that he hath done this.
Psalm 22:31
It is finished".
John 19:30
The reading
A psalm's last line and Jesus' last breath in John close on the very same note: it is done.
The psalm closes looking ahead, to God's saving work, accomplished, and told to a people not yet born. Its final line:
...that he hath done this.
Psalm 22:31
Done. And as Jesus hung dying, John records His final word:
It is finished".
John 19:30
Different words, in different tongues, a thousand years apart, but the same note: a finished work.
So what's left for you to finish? Nothing, only Someone to come home to: the One who said it is done.
Every quotation is the King James Version, verified word for word against the text.