Fasting: Confession of Sin
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1 Samuel 7:6
When they had gathered at Mizpah, they drew water and poured it out before the LORD. On that day they fasted, and there they confessed, “We have sinned against the LORD.” And Samuel judged the Israelites at Mizpah.
Nehemiah 9:1, 2
On the twenty-fourth day of the same month, the Israelites gathered together, fasting and wearing sackcloth, with dust on their heads. / Those of Israelite descent separated themselves from all the foreigners, and they stood and confessed their sins and the iniquities of their fathers.