C. F. Keil and Franz Delitzsch on Isaiah 31:6

Isa 31:6

On the ground of this half terrible, half comforting picture of the future, the call to repentance is now addressed to the people of the prophet’s own time. “Then turn, O sons of Israel, to Him from whom men have so deeply departed.” Strictly speaking, “to Him with regard to whom (אשׁר) ye are deeply fallen away” (he‛ĕmı̄q, as in Hos 9:9, and sârâh, that which is alienated, alienation, as in Isa 1:5); the transition to the third person is like the reverse in Isa 1:29. This call to repentance the prophet strengthens by two powerful motives drawn from the future.