'Thousand' in the Bible

When the man went out toward the east with a measuring line in his hand, he measured a thousand cubits, and he led me through the water, water that was ankle-deep.

Again he measured a thousand [cubits] and led me through the water, water that was knee-deep. Again he measured a thousand [cubits] and led me through the water, water reaching the hips.

Again he measured a thousand [cubits]; and it was a river that I could not pass through, for the water had risen, enough water to swim in, a river that could not be crossed [by wading].