Judges 20:26וַיָּצוּמוּ
Then the Israelites, all the people, went up to Bethel, where they sat weeping before the LORD. That day they fasted until evening and presented burnt offerings and peace offerings to the LORD.
1 Samuel 7:6וַיָּצוּמוּ
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.
2 Samuel 1:12וַיָּצֻמוּ
They mourned and wept and fasted until evening for Saul and his son Jonathan, and for the people of the LORD and the house of Israel, because they had fallen by the sword.
Esther 4:16וְצוּמוּ
“Go and assemble all the Jews who can be found in Susa, and fast for me. Do not eat or drink for three days, night or day, and I and my maidens will fast as you do. After that, I will go to the king, even though it is against the law. And if I perish, I perish!”
Isaiah 58:3צַּמְנוּ
“Why have we fasted, and You have not seen? Why have we humbled ourselves, and You have not noticed?” “Behold, on the day of your fast, you do as you please, and you oppress all your workers.
Zechariah 7:5צַמְתֶּם
“Ask all the people of the land and the priests, ‘When you fasted and mourned in the fifth and seventh months for these seventy years, was it really for Me that you fasted?

Brown-Driver-Briggs

[צוּם] vb. abstain from food, fast

Sources: Brown-Driver-Briggs (1906, public domain) from the Open Scriptures Hebrew Lexicon (CC BY 4.0), glosses from STEPBible TBESH (CC BY 4.0); STEPBible TAHOT (Hebrew Bible, Leningrad Codex, CC BY 4.0); the Berean Standard Bible (public domain). Reformatted by Word Study, wording unchanged. All sources and licenses.