'Lines' in the Bible

Will make a circle round the king, every man being armed; and whoever comes inside your lines is to be put to death; keep with the king, when he goes out and when he comes in.

Then Jehoiada the priest gave orders to those who were placed in authority over the army, saying, Take her outside the lines, and let anyone who goes after her be put to death with the sword, for he said, Let her not be put to death in the house of the Lord.