The Mekhilta continues its meditation on the Song of the Sea by enumerating the reasons God is worthy of song. "I shall sing to the Lord," the Israelites declared — and one reason is that God is rich beyond all reckoning. Not rich in the way a human king hoards gold. Rich in the sense that everything in existence belongs to Him.
The proof texts cascade across the Hebrew Bible. "To the Lord your God are the heavens" (Deuteronomy 10:14) — the entire sky and everything beyond it. "To the Lord is the earth and its fullness" (Psalms 24:1) — every continent, mountain, and valley. "His is the sea and He has made it" (Psalms 95:5) — the oceans that swallowed Pharaoh's army. "Mine is the silver and Mine is the gold" (Haggai 2:8) — all wealth in human hands is merely on loan. And finally, the most profound claim: "All of the souls are Mine. The soul of the father and the soul of the son alike are Mine" (Ezekiel 18:4).
The progression moves from the cosmic to the personal. God owns the heavens, then the earth, then the sea, then precious metals, and finally — the most intimate possession of all — every human soul. The Mekhilta establishes that God's wealth is not a metaphor. It is ontological reality. Nothing exists outside of divine ownership. The Israelites sang at the sea because they understood in that moment what the verses spell out: the God who saved them does not lack anything, has never needed anything, and owns everything — including the very breath in their lungs.