2 Kings 21:13 - Matthew Poole's English Annotations on the Holy Bible

Jerusalem shall have the same measure and lot, i.e. the same judgments, which Samaria had. The line is oft put for one's lot or portion, as Psalms 16:6 2 Corinthians 10:16, because men's portions or possessions used to be measured by lines, Psalms 78:55 Amos 7:17. Or it is a metaphor from workmen who mark out by lines what part of the building they would have thrown down, and what they would have stand. See Isaiah 34:11 Lamentations 2:8 Amos 7:7,8 Zec 1:16. Or it is an allusion to that fact of David, who destroyed the Moabites by a measuring line, 2 Samuel 8:2. Wiping it, and turning it upside down, as men do with a dish that hath been used; first wholly empty it of all that is in it, then thoroughly cleanse and wipe it, and lastly turn it upside down, that nothing may remain in it: so will I deal with Jerusalem, thoroughly empty and purge it from all its wicked inhabitants, and that so as to cut off all hopes of restitution.