The Psalm is almost, but not quite imprecatory, perhaps because it is a choir piece intended for worship and it’s hard to curse and worship simultaneously! Leviticus lays out the ground rules for some festivals. Revelation affords us a peek into heaven.

Divine head must shake
As foolish men run hither
Whisp’ring their nonsense
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Commemorate well
Your seasons of fast and feast.
Recall our stories.
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A vision splendid
Pulls trials into focus
And all shall be well.
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