C. F. Keil and Franz Delitzsch on Isaiah 37:31-32

Isa 37:31-32

Seventh turn, “And that which is escaped of the house of Judah, that which remains will again take root downward, and bear fruit upward. For from Jerusalem will a remnant go forth, and a fugitive from Mount Zion; the zeal of Jehovah of hosts (K.chethib omitstsebhâ'ōth)will carry this out.” The agricultural prospect of the third year shapes itself there into a figurative representation of the fate of Judah. Isaiah’s watchword, “a remnant shall return,” is now fulfilled; Jerusalem has been spared, and becomes the source of national rejuvenation. You year the echo of Isa 5:24; Isa 9:6, and also of Isa 27:6. The word tsebhâ'ōth is wanting in Kings, here as well as in Isa 37:17; in fact, this divine name is, as a rule, very rare in the book of Kings, where it only occurs in the first series of accounts of Elijah (1Ki 18:15; 1Ki 19:10, 1Ki 19:14; cf., 2Ki 3:14).