30,000

So Joshua and the whole army set out to attack Ai. Joshua chose 30,000 mighty men of valor and sent them out at night

And when Saul numbered them at Bezek, there were 300,000 Israelites and 30,000 men of Judah.

Then King Solomon conscripted a labor force of 30,000 men from all Israel.

From his own flocks and herds Josiah contributed 30,000 lambs and goats plus 3,000 bulls for the Passover offerings for all the people who were present.