“To declare, I say, at this time his righteousness: that he might be just, and the justifier of him which believeth in Jesus.”
King James Version (KJV)
3:26 For a demonstration of his righteousness - Both of his justice and mercy. That he might be just - Showing his justice on his own Son. And yet the merciful justifier of every one that believeth in Jesus. That he might be just - Might evidence himself to be strictly and inviolably righteous in the administration of his government, even while he is the merciful justifier of the sinner that believeth in Jesus. The attribute of justice must be preserved inviolate; and inviolate it is preserved, if there was a real infliction of punishment on our Saviour. On this plan all the attributes harmonize; every attribute is glorified, and not one superseded no, nor so much as clouded.
Ro 3:26 That he might be just. Can God be just, and yet justify the sinner? Only, because justice was fully satisfied when the sinless Christ died, not for himself, but for his people. The believer in Christ Jesus, trusting in him, baptized into Christ, into his death, is in Christ, and Christ hath paid the penalty for all who are found in him.