8. plumb-line in . . . midst of . . . Israel—No longer are the symbols, as in the former two, stated generally; this one is expressly applied to Israel. God's long-suffering is worn out by Israel's perversity: so Amos ceases to intercede (compare Ge 18:33). The plummet line was used not only in building, but in destroying houses (2Ki 21:13; Isa 28:17; 34:11; La 2:8). It denotes that God's judgments are measured out by the most exact rules of justice. Here it is placed "in the midst" of Israel, that is, the judgment is not to be confined to an outer part of Israel, as by Tiglath-pileser; it is to reach the very center. This was fulfilled when Shalmaneser, after a three years' siege of Samaria, took it and carried away Israel captive finally to Assyria (2Ki 17:3, 5, 6, 23).