Fasting: Humiliation
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Deuteronomy 9:18
Then I fell down before the LORD for forty days and forty nights, as I had done the first time. I did not eat bread or drink water because of all the sin you had committed in doing what was evil in the sight of the LORD and provoking Him to anger.
Nehemiah 9:1
On the twenty-fourth day of the same month, the Israelites gathered together, fasting and wearing sackcloth, with dust on their heads.