1 Samuel 4:10 in the World English Bible
The Philistines fought, and Israel was defeated, and each man fled to his tent. There was a very great slaughter; for thirty thousand footmen of Israel fell.
Context
9 Be strong, and quit yourselves like men, O ye Philistines, that ye be not servants unto the Hebrews, as they have been to you: quit yourselves like men, and fight.
10 And the Philistines fought, and Israel was smitten, and they fled every man into his tent: and there was a very great slaughter; for there fell of Israel thirty thousand footmen.
11 And the ark of God was taken; and the two sons of Eli, Hophni and Phinehas, were slain.