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Psalm 22:22. I will declare thy name unto my brethren. Hebrews applies it to the risen Christ.
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.
I will declare thy name unto my brethren: in the midst of the congregation will I praise thee.
Psalm 22:22
not ashamed to call them brethren
Hebrews 2:11
The reading
Most people stop reading Psalm twenty-two at the cross. Keep going, it doesn't end in a grave.

But the cry doesn't stay forsaken. Later, the psalm turns, the same voice moves from anguish to praise:

I will declare thy name unto my brethren: in the midst of the congregation will I praise thee.
Psalm 22:22

Who is that praising voice? Hebrews takes that opening line, word for word, and puts it in the mouth of the risen Christ. The psalm's turn is Jesus, alive on the far side of the cross.
And hear what He calls us. Hebrews says He is,
not ashamed to call them brethren
Hebrews 2:11
, brothers. Family.

The same Jesus who cried out forsaken now lives, and the risen Christ is not ashamed to call His own brethren. He is calling you into that family.
Every quotation is the King James Version, verified word for word against the text.