Mark 12:31 → Leviticus 19:18

When the scribe asks which commandment is greatest, Jesus answers with two — the Shema (Deut 6:4-5) and Leviticus 19:18, quoted verbatim: "Love your neighbor as yourself. No other commandment is greater than these." This is the single most consequential dominical use of Lev 19:18: Jesus lifts a verse buried in the Holiness Code and installs it, alongside the Shema, as one of the two commands on which all the Law and the Prophets hang (cf. Matt 22:40). The pairing is not arbitrary; it discloses the inner structure of the whole law — vertical love of God overflowing into horizontal love of neighbor — so that Lev 19:18 is revealed as the integrating principle of the second table that the rest of Torah only expounds. Mark sharpens the point in the scribe's reply (12:33): to love God and neighbor "is more important than all burnt offerings and sacrifices," echoing the prophetic priority of covenant love over cult (Hos 6:6; 1 Sam 15:22). This is fulfillment, not abrogation: Jesus does not loosen the command but exposes its true weight and scope. The telos guards against moralism here — Jesus does not merely name the greatest commandments; He is the one who keeps them perfectly and then lays down His life to fulfill the love He commands (Rom 5:8; John 15:13). The redeemed love neighbor not to earn the kingdom but because the King who first loved them now writes this command on the heart (Jer 31:33), so that loving the neighbor becomes the overflow of a heart satisfied in God rather than a debt anxiously paid.