"justify him" is correct and usable in written English.
You could use it in a sentence like "The lawyer had to justify him in court for his actions."
He could, therefore, declare the person righteous, or "justify" him, even though the person was still a sinner.
Has he done any scientific work to justify him in setting scientific results aside with such confidence?
"The fact that he was strongly suspected of being involved in criminal wrongdoing does not justify him or anyone else being summarily killed".
Kaufman and Hart portray Niles as grasping, deceitful, and corrupt, yet go to great lengths to justify him, ultimately shifting the blame for his descent into prosperity to the women in his life.
"Whether through misjudgment, panic, or some other reason, Mr Long opened fire and took another life when the circumstances at the moment he pulled the trigger did not justify him in so doing.
Mr McNamee thinks there is enough private activity to justify him starting work on three more waterfront office blocks.Second, much of the building work has been subsidised by the European Union, which has designated Merseyside one of the poorest parts of Europe.
Events justified him, but to disobey orders so blatantly was unforgivable.
But what justifies him in believing that his sense of touch is more reliable than his vision?
He basically shares my view of what happened in our childhood, but he thinks that I was too easy on our father, that I've justified him too much.
In this he succeeded, and time has justified him: his mansion is still nobly standing, while the Vanderbilts' great homes have long since fallen in New York's assault on its past.
According to this interpretation of Paul's teaching, grace was not infused in the sinner to the point that he or she became acceptable and pleasing to God; instead, while the individual remained a sinner, God accepted him favourably and justified him.
