1 Samuel 7:6
“And they gathered together to Mizpeh, and drew water, and poured it out before the Lord, and fasted on that day, and said there, We have sinned against the Lord. And Samuel judged the children of Israel in Mizpeh.”
Then the children of Israel did put away Baalim and Ashtaroth, and served the Lord only.
And Samuel said, Gather all Israel to Mizpeh, and I will pray for you unto the Lord.
And they gathered together to Mizpeh, and drew water, and poured it out before the Lord, and fasted on that day, and said there, We have sinned against the Lord. And Samuel judged the children of Israel in Mizpeh.
And when the Philistines heard that the children of Israel were gathered together to Mizpeh, the lords of the Philistines went up against Israel. And when the children of Israel heard it, they were afraid of the Philistines.
And the children of Israel said to Samuel, Cease not to cry unto the Lord our God for us, that he will save us out of the hand of the Philistines.
Counter-Arguments
The strongest case that this verse does not belong in this theme.

Cross-References
“Therefore also now, saith the Lord, turn ye even to me with all your heart, and with fasting, and with weeping, and with mourning:”
“Then I proclaimed a fast there, at the river of Ahava, that we might afflict ourselves before our God, to seek of him a right way for us, and for our little ones, and for all our substance.”
“For we must needs die, and are as water spilt on the ground, which cannot be gathered up again; neither doth God respect any person: yet doth he devise means, that his banished be not expelled from him.”
“And Hannah answered and said, No, my lord, I am a woman of a sorrowful spirit: I have drunk neither wine nor strong drink, but have poured out my soul before the Lord.”
“And Jehoshaphat feared, and set himself to seek the Lord, and proclaimed a fast throughout all Judah.”