When God commanded that a jar of manna be preserved for future generations (Exodus 16:32), Moses relayed the instruction to his brother Aaron. But when exactly did Aaron carry it out? One might assume he waited until the fortieth year of wandering, near the end of his life. The Mekhilta rejects that assumption entirely.
The proof lies in a single verse: "And Aaron placed it before the testimony" (Exodus 16:34). The "testimony" refers to the Ark of the Covenant, and the Ark was not built until the second year after the Exodus, when Bezalel constructed the Tabernacle. If Aaron placed the manna jar before the Ark, he must have done so in the second year — not decades later.
This seemingly minor chronological detail carries a deeper lesson. Aaron did not procrastinate when it came to fulfilling a divine command. The moment the Ark existed, the manna was placed before it. The rabbis of the Mekhilta use this textual detective work to demonstrate that sacred obligations should be fulfilled at the earliest possible moment, not deferred to some distant future.
The jar of manna itself was a teaching tool. Future generations who never tasted the miraculous bread that fell from heaven each morning would be able to see it with their own eyes — physical proof that God sustained an entire nation in the wilderness for forty years.