James 2:8 → Leviticus 19:18

James cites Lev 19:18 verbatim and gives it a title found nowhere else in Scripture — "the royal law" (νόμος βασιλικός): "If you really fulfill the royal law stated in Scripture, 'Love your neighbor as yourself,' you are doing well" (2:8). The designation does triple work. It is royal because it belongs to the King and His kingdom, the integrating law of the messianic reign; royal because it is sovereign over and summarizes the whole interpersonal law (as Paul says it sums the second table, Rom 13:9, and the whole law, Gal 5:14); and royal because, like a king, it governs all the lesser statutes James goes on to cite (2:11). James deploys the command as the church's concrete criterion of impartiality: showing favoritism to the rich over the poor (2:1-7) is a direct breach of "love your neighbor as yourself," because partiality is precisely a refusal to measure the neighbor's worth as one measures one's own. This is no separate OT target from the existing James 2:8 → Deut 10:18-19 pair, which traces the impartiality background; here the focus is the explicit citation of Lev 19:18 itself as the royal law. The telos guards against turning the royal law into mere social ethics: James grounds the command in the "glorious Lord Jesus Christ" (2:1), so that impartial neighbor-love is the visible fruit of a faith that beholds Christ's own impartial, self-giving love. The King who is the royal law's true keeper first loved His people without partiality (Rom 5:8); only such a love, received and savored, can produce in the church a love for the poor that is delight rather than condescending duty.