King James Version
To declare, I say, at this time his righteousness: that he might be just, and the justifier of him which believeth in Jesus.English Standard Version
It was to show his righteousness at the present time, so that he might be just and the justifier of the one who has faith in Jesus.New International Version
he did it to demonstrate his justice at the present time, so as to be just and the one who justifies those who have faith in Jesus.