Isa 8:1 Moreover the LORD said unto me, Take thee a great roll, and write in it with a man's pen concerning Mahershalalhashbaz.
Isa 8:2 And I took unto me faithful witnesses to record, Uriah the priest, and Zechariah the son of Jeberechiah.
Isaiah was to write plainly on a scroll, for everyone to read concerning Mahershalkalhashbaz, which means speed to the spoil, hurry to the plunder.The prophecy was concerning Assyria coming swiftly to defeat Syria and Israel; a promise to king Ahaz. Two witnesses are needed to establish a truth. Uriah and Zechariah, were witnesses to the written message.
Isa 8:3 And I went unto the prophetess; and she conceived, and bare a son. Then said the LORD to me, Call his name Mahershalalhashbaz.
This was the name of their son; Mahershalalhashbaz, Isaiah's wife would conceive. She may have been a prophetess, but probably this was a name given meaning, the wife of the prophet.
Isa 8:4 For before the child shall have knowledge to cry, My father, and my mother, the riches of Damascus and the spoil of Samaria shall be taken away before the king of Assyria.
Assyria was coming before the child could speak mama, abba; to take the spoil of Syria and Israel.