'Line' in the Bible

So in the half light they got up to go to the tents of Aram; but when they came to the outer line of tents, there was no one there.

And when those lepers came to the outer line of tents, they went into one tent, and had food and drink, and took from it silver and gold and clothing, which they put in a secret place; then they came back and went into another tent from which they took more goods, which they put away in a secret place.

When Athaliah the mother of Ahaziah saw that her son was dead, she was determined to destroy the entire royal line.

And I will stretch over Jerusalem the line of Samaria, and the plummet of the house of Ahab: and I will wipe Jerusalem as a man wipeth a dish, wiping it, and turning it upside down.