In 3333, Yechezkel Hanavi received a nevuah at the river of Chebar about Maaseh Merkavah. That perek is read as the haftarah on Shavuos.To unpack that, this is the anniversary of the prophecy of the prophet Ezekiel concerning Maaseh Merkavah, "the working of the chariot." This was a vision of the heavenly realm, some of its frightening denizens, and the throne of God and its occupant. It took place by the river Chebar in Babylonia in 593 BCE. The relevant biblical passage, Ezekiel chapter 1, is the prophetic synagogue reading on Shavuot. There are further details in the links below.
Past posts on this anniversary and on Ezekiel 1 and its mystical and cultural afterlife, are here and here. And this year's post from Shavuot is also relevant.
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