Let not the sun go down on your wrath
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Meaning
Do not hold on to your anger for more than one day.
Origin
This expression derives from the Bible, Ephesians 4:26. The earliest version printed in English is in Coverdale's Bible, 1535:
Be angrie, but synne not. Let not ye Sonne go downe vpo youre wrath.
See also: the List of Proverbs.

