The Hyperlinked Bible
Intertextuality Pair
Echo
Later text
If anyone says, "I love God," but hates his brother, he is a liar. For anyone who does not love his brother, whom he has seen, cannot love God, whom he has not seen. And we have this command from Him: Whoever loves God must love his brother as well.
Earlier text
Do not seek revenge or bear a grudge against any of your people, but love your neighbor as yourself. I am the LORD.
Leviticus 19:18 legislates an interior disposition — wəʾāhabtā lərēʿăkā kāmôkā, "you shall love your neighbor (rēaʿ) as yourself" — under the divine signature "I am the LORD," making love of the fellow-member the integrating principle of covenant ethics. John 4:21 reaches for that same covenant demand when it grounds its claim in a received word: "we have this command (entolē) from Him: Whoever loves God must love his brother as well." This is the same old-yet-new-commandment formula the vault already roots in Lev 19:18 at 1 John 2:7-8 and 2 John 5-6; and 4:21's double-bond — love God, therefore love your brother — reproduces the very structure of Jesus' two-commandments summary (Deut 6:5 + Lev 19:18, Mark 12:28-34), with 4:20 supplying its sharpest argument: the visible brother is the test-case of love for the invisible God ("anyone who does not love his brother, whom he has seen, cannot love God, whom he has not seen"). The connection is named an Echo, not an Allusion or Quotation, because the dependence is real but mediated and non-verbal: John quotes no clause of Lev 19:18, drops kāmôkā, and — following Jesus' "new commandment" of John 13:34 ("love one another") — narrows the Levitical rēaʿ/plēsion (any fellow) to the intra-community adelphos (brother). The proximate channel is therefore John 13:34, but the substance John presses on his readers is the ancient Lev 19:18 demand, now retrieved and intensified. The method is Longitudinal Theme + Promise-Fulfillment, not Typology (anti-default: love is not a person, event, or institution prefiguring a greater — it is the substance of the command, continued and Christologically internalized; Jesus fulfills rather than abrogates it, Matt 5:17). And the telos is built into John's own grammar: the command rests on a prior gift — "We love because He first loved us" (4:19), the Son sent "as the atoning sacrifice for our sins" (4:10) — so that loving the brother is not a moralistic striving to secure God but the overflow of having tasted that God is love (4:16). Here the veil lifts on Lev 19:18: the command that once only measured love by self-love now reveals the God who is Love, and to behold Him so is to find the brother no longer a duty but the very face in which the beloved God becomes desirable.