Joshua 7:5; Joshua 8:3; Joshua 12:24

Joshua 7:5

5 And the men of Ai smote of them about thirty and six men: for they chased them from before the gate even unto Shebarim, and smote them in the going down: wherefore the hearts of the people melted, and became as water.

Joshua 8:3

3 So Joshua arose, and all the people of war, to go up against Ai: and Joshua chose out thirty thousand mighty men of valour, and sent them away by night.

Joshua 12:24

24 The king of Tirzah, one: all the kings thirty and one.