"Chapter 30—Deliverance From Assyria In a time of grave national peril, when the hosts of Assyria were invading the land of Judah and it seemed as if nothing could save Jerusalem from utter destruction, Hezekiah rallied the forces of his realm to resist with unfailing courage their heathen oppressors and to trust in the power of Jehovah to deliver. “Be strong and courageous, be not afraid nor dismayed for the king of Assyria, nor for all the multitude that is with him,” Hezekiah exhorted the men of Judah; “for there be more with us than with him: with him is an arm of flesh; but with us is the Lord our God to help us, and to fight our battles.” 2 Chronicles 32:7, 8 . PK 349"
"Be strong and courageous, be not afraid nor dismayed for the king of Assyria, nor for all the multitude that is with him: for there be more with us than with him:"
The EGW passage directly quotes 2 Chronicles 32:7, making it a clear and explicit allusion.
"It was not without reason that Hezekiah could speak with certainty of the outcome. The boastful Assyrian, while used by God for a season as the rod of His anger for the punishment of the nations, was not always to prevail. See Isaiah 10:5 . “Be not afraid of the Assyrian,” had been the message of the Lord through Isaiah some years before to those that dwelt in Zion; “for yet a very little while, ... and the Lord of hosts shall stir up a scourge for him according to the slaughter of Midian at the rock of Oreb: and as His rod was upon the sea, so shall He lift it up after the manner of Egypt. And it shall come to pass in that day, that his burden shall be taken away from off thy shoulder, and his yoke from off thy neck, and the yoke shall be destroyed because of the anointing.” Verses 24-27 . PK 349.2"
"O Assyrian, the rod of mine anger, and the staff in their hand is mine indignation."
Ellen White directly references Isaiah 10:5 in this passage.
"Therefore thus saith the Lord God of hosts, O my people that dwellest in Zion, be not afraid of the Assyrian: he shall smite thee with a rod, and shall lift up his staff against thee, after the manner of Egypt."
EGW directly quotes Isaiah 10:24.
"And the Lord of hosts shall stir up a scourge for him according to the slaughter of Midian at the rock of Oreb: and as his rod was upon the sea, so shall he lift it up after the manner of Egypt."
EGW directly quotes Isaiah 10:26.