'Line' in the Bible

This is what he let me see: and I saw the Lord stationed by a wall made straight by a weighted line, and he had a weighted line in his hand.

And the Lord said to me, Amos, what do you see? And I said, A weighted line. Then the Lord said, See, I will let down a weighted line among my people Israel; never again will my eyes be shut to their sin:

Therefore thus saith the LORD; Thy wife shall be an harlot in the city, and thy sons and thy daughters shall fall by the sword, and thy land shall be divided by line; and thou shalt die in a polluted land: and Israel shall surely go into captivity forth of his land.