3. prophetess--perhaps the same as the "virgin" (Isa 7:14), in the interim married as Isaiah's second wife: this is in the primary and temporary sense. Immanuel is even in this sense distinct from Maher-shalal-hash-baz. Thus nineteen months at least intervene from the prophecy (Isa 7:14), nine before the birth of Immanuel, and ten from that time to the birth of Maher-shalal-hash-baz: adding eleven or twelve months before the latter could cry, "Father" (Isa 8:4), we have about three years in all, agreeing with Isa 7:15, 16.

JFB.