en_tn/rom/03/24.md

they are freely justified by his grace through the redemption that is in Christ Jesus

Here "justified" refers to being made right with God. You can translate this in an active form. AT: "God makes them right with himself as a free gift, because Christ Jesus sets them free" (See: rc://en/ta/man/translate/figs-explicit and rc://en/ta/man/translate/figs-activepassive)

they are freely justified

This means that they are justified without having to earn or merit being justified. God freely justifies them. AT: "they are made right with God without earning it"