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What did Hashem have in mind, when He issued the command to put away an earthenware flask of Manna for their generations?
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Rashi and Targum Yonasan: When Yirmeyah ha'Navi rebuked the people for not studying Torah, and they replied that they needed the time to indulge in Parnasah, he took out the bottle of Manna, pointed at it, and declared that in the desert that is what sustained them. 1 This was a clear proof that Hashem has many ways of sustaining those who fear Him, and that if they would do His will by studying Torah, He would send His Sheluchim to sustain them.
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Based on Yirmeyah 2:31 .