Moses’ final message to the Jewish people was not another law but a song.

As Israel prepared to enter its land, Moses called heaven and earth as witnesses and described a future in which prosperity would lead to complacency, complacency to ingratitude and ingratitude to decline. The people who had depended upon God for water, food and protection in the desert would settle the land, enjoy its abundance and eventually mistake blessing for entitlement. “Jeshurun grew fat and kicked.” The danger Moses foresaw was not that hardship would break the Jews, but that success would cause them to forget who they were.

Haazinu was intended as protection against that forgetting. God instructed Moses to write the song, teach it to the Israelites and place it in their mouths so that it would remain a witness among them. The Torah had already been given, the commandments were known and the covenant had been renewed, yet one final safeguard was required. The people had to internalize a warning about themselves that prosperity would otherwise make easy to dismiss.

This makes Haazinu the mirror image of the Torah’s other great song. At the sea, the Israelites were trapped between Pharaoh’s army and the water, free from slavery but not yet able to imagine themselves as a free people. When the sea opened and they crossed on dry land, gratitude rose naturally from within them and was directed toward God. A miracle entered their hearts and emerged through their mouths as the Song of the Sea.

Haazinu travels in the opposite direction. It does not rise spontaneously from the Jewish people but comes from God through Moses and is placed into their mouths so that it may eventually enter their hearts. The Song of the Sea is the Jews expressing to God what they have just experienced; Haazinu is God telling the Jews what they must learn about themselves. One is exuberant and immediate, sung at the moment terror gives way to triumph. The other is measured and unsettling, looking beyond victory toward the temptations victory will create. One moves from the heart to the mouth. The other must move from the mouth into the heart.

That difference may explain why Moses’ final instruction takes the form of song rather than another commandment. Law can remain external to the person who possesses it. A scroll may be stored, honored and ignored, while a commandment may be studied without becoming instinct. A song enters through repetition, settles into memory and returns when the book is closed. Haazinu was written to remain inside the Jewish people as their circumstances changed, so that when later generations prospered and forgot, declined and wondered why, the warning would already be present in words they had learned to sing. The Torah was not insufficient as law, but it also had to become memory.

The two songs describe opposite movements of the wheel of Jewish history. At the sea, Israel stood at the bottom: former slaves, defenseless and pursued by the most powerful army they knew. The sea opened and the wheel turned upward, carrying them from slavery to freedom, terror to triumph. Haazinu addresses a people traveling in the other direction. Israel is about to possess a land, build a society and enjoy an abundance unavailable in the desert, but Moses warns that prosperity may produce forgetfulness and that the wheel can turn down as quickly as it turned up. The Song of the Sea gives hope to Jews trapped at the bottom; Haazinu gives warning to Jews comfortable at the top.

For much of the postwar period, particularly in the United States, many Jews came to believe that the wheel had finally stopped turning. Legal barriers fell, universities and professions opened, and open antisemitism became disreputable. Each generation appeared more secure and integrated than the one before it, until the dangers of Jewish history remained vivid in memory but increasingly remote from daily experience. The central questions became how fully Jews could participate in the surrounding society and how little distinctiveness that participation required. The golden age was not merely enjoyed; its permanence was assumed.

That assumption has become harder to sustain. American Jewish life remains strong, but its direction no longer feels assured as hatreds thought driven to the margins return to streets, campuses, politics and culture. Crowds celebrate the murder of Jews, universities explain away their intimidation and public figures revive ancient accusations in the language of contemporary justice. None of this means that catastrophe is inevitable or that American Jewish life is ending. It does mean that uninterrupted progress can no longer be treated as a law of history, and that Jews who spent generations asking how much further they might rise must now consider whether the wheel has begun moving the other way.

There is something remarkable about the place of the two songs in Jewish life. The Song of the Sea, born as the spontaneous response of one generation, is recited every morning, while Haazinu, composed to warn future generations, is generally heard once a year. The upward song became daily prayer, while the warning from the top became an annual interruption.

Perhaps that balance served a people that needed constant reassurance that redemption remained possible. It is less obviously sufficient for Jews who have known extraordinary acceptance and are only beginning to recognize its fragility. The danger is not that Jews have forgotten the Song of the Sea. It is that they have mistaken it for the entire story.