The eternal survival and chosen status of the Israelites are guaranteed by linking their destiny to the very fabric of the universe. God ties the spiritual purpose and physical continuity of the nation directly to the unbreakable laws of nature that sustain creation.
The primary approach among commentators notes an impossible condition set by God. The fixed laws of nature—specifically the unending cycles and orbits of the sun, the moon, and the stars—are permanent. Just as these celestial bodies will never shift from their courses or be removed from before God, the descendants of Israel will never cease to exist.
This comparison to the heavens carries profound meaning. [רד״ק] highlights a crucial distinction: while earlier historical events demonstrated great divine power, the eternity of the Israelites is specifically compared to the laws of the sun, moon, and stars, rather than to the parting of the sea. The splitting of the sea was a temporary disruption of nature that ended when the waters returned to their normal state by morning. In contrast, the existence of the Israelites is matched to the celestial system, which represents a permanent, unchanging stability that lasts forever.
Furthermore, the promise that the Israelites will never stop being a nation before God goes far beyond mere physical survival. It is a guarantee of spiritual continuity and purpose. They will never lose their status as a special and chosen people [מצודת דוד]. Their unique calling to be a holy nation standing directly before God is entirely unchangeable [מלבי״ם], ensuring that they will remain His devoted servants for all time [רד״ק].