Giosuè 18:4

Give out from among you three men for [each] tribe: and I will send them, and they shall rise, and go through the land, and describe it according to the inheritance of them; and they shall come [again] to me.

Ver. 4. Give out from amongst you three men.] Geodaetae, men skilful in surveying and map making; men of courage also and vigour, that dare undertake and can carry on such a dangerous enterprise.