The Mekhilta preserves a striking exchange drawn from the Song of Songs, imagined as a conversation between the nations of the world and Israel about Israel's unique relationship with God.
When the nations hear Israel describing the beauty and glory of their Beloved — God — they are overcome with desire to share in that relationship. They turn to Israel and say, using the words of Song of Songs (6:1): "Where did your Beloved go, you loveliest among the women? Whither has your Beloved turned? Let us seek Him with you." The nations, impressed by Israel's passionate devotion, want to join the search. They want access to the same God, the same intimacy, the same covenant.
Israel's response is gentle but firm. Quoting Song of Songs (2:16), Israel replies: "My Beloved is mine, and I am His." And again (Song of Songs 6:3): "I am my Beloved's, and my Beloved is mine, who grazes His flock among the lilies." The relationship is exclusive — not because God is unavailable, but because the bond between God and Israel is a covenant of mutual belonging that cannot simply be joined by outsiders on a whim.
The Mekhilta uses this dialogue to make a profound point about the nature of covenant. The nations admire Israel's relationship with God and wish to participate. But a covenant is not a club anyone can join by showing up. It was forged at Sinai, sealed with Torah, tested through exile and suffering. "My Beloved is mine, and I am His" — this is not exclusion but the language of a relationship earned through centuries of faithfulness.