7. The instinct of the migratory birds leads them with unfailing regularity to return every spring from their winter abodes in summer climes (So 2:12); but God's people will not return to Him even when the winter of His wrath is past, and He invites them back to the spring of His favor.
      in the heaven--emphatical. The birds whose very element is the air, in which they are never at rest, yet show a steady sagacity, which God's people do not.
      times--namely, of migrating, and of returning.
      my people--This honorable title aggravates the unnatural perversity of the Jews towards their God.
      know not, &c.-- (Jer 5:4, 5; Isa 1:3).

JFB.