'Thousand' in the Bible

When the man went out toward the east with a line in his hand, he measured a thousand cubits, and he led me through the water, water reaching the ankles.

Again he measured a thousand and led me through the water, water reaching the knees. Again he measured a thousand and led me through the water, water reaching the loins.

Again he measured a thousand; and it was a river that I could not ford, for the water had risen, enough water to swim in, a river that could not be forded.