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 Psa_16:62Co_10:16, because men’s portions or possessions used to be measured by lines, Psa_78:55Amo_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 Isa_34:11Lam_2:8Amo_7:7,8 Zec 1:16. Or it is an allusion to that fact of David, who destroyed the Moabites by a measuring line, 2Sa_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.