"“Until the cities be wasted without inhabitant, And the houses without man, And the land be utterly desolate, And the Lord have removed men far away, And there be a great forsaking in the midst of the land.” Verse 11, 12 . PK 309.1"
"Then said I, Lord, how long? And he answered, Until the cities be wasted without inhabitant, and the houses without man, and the land be utterly desolate,"
EGW directly quotes Isaiah 6:11, making this a clear and explicit allusion.
"The heavy judgments that were to befall the impenitent,—war, exile, oppression, the loss of power and prestige among the nations,—all these were to come in order that those who would recognize in them the hand of an offended God might be led to repent. The ten tribes of the northern kingdom were soon to be scattered among the nations and their cities left desolate; the destroying armies of hostile nations were to sweep over their land again and again; even Jerusalem was finally to fall, and Judah was to be carried away captive; yet the Promised Land was not to remain wholly forsaken forever. The assurance of the heavenly visitant to Isaiah was: PK 309.2"
"Then said I, Lord, how long? And he answered, Until the cities be wasted without inhabitant, and the houses without man, and the land be utterly desolate,"
The EGW passage describes the coming desolation and exile, which directly alludes to Isaiah 6:11, where Isaiah asks how long the desolation will last.
"And I will bring the land into desolation: and your enemies which dwell therein shall be astonished at it."
Both passages discuss the desolation of the land as a consequence of disobedience. The EGW passage describes the judgments that were to befall the impenitent, including war, exile, and oppression, while Leviticus 26:32 speaks of the land being brought into desolation. While not a direct quote, the theme of desolation as a consequence of sin is present in both.
"their leaves: So the holy seed shall be the substance thereof.” Verse 13 . PK 309.3"
"But yet in it shall be a tenth, and it shall return, and shall be eaten: as a teil tree, and as an oak, whose substance is in them, when they cast their leaves: so the holy seed shall be the substance thereof."
EGW directly quotes Isaiah 6:13.