"Before His presence “all faces are turned into paleness;” upon the rejecters of God's mercy falls the terror of eternal despair. “The heart melteth, and the knees smite together, ... and the faces of them all gather blackness.” Jeremiah 30:6 ; Nahum 2:10 . The righteous cry with trembling: “Who shall be able to stand?” The angels’ song is hushed, and there is a period of awful silence. Then the voice of Jesus is heard, saying: “My grace is sufficient for you.” The faces of the righteous are lighted up, and joy fills every heart. And the angels strike a note higher and sing again as they draw still nearer to the earth. GC 641.1"
"Ask ye now, and see whether a man doth travail with child? wherefore do I see every man with his hands on his loins, as a woman in travail, and all faces are turned into paleness?"
Ellen White directly references Jeremiah 30:6 in this passage.
"She is empty, and void, and waste: and the heart melteth, and the knees smite together, and much pain is in all loins, and the faces of them all gather blackness."
Ellen White directly references Nahum 2:10 in this passage.
"The King of kings descends upon the cloud, wrapped in flaming fire. The heavens are rolled together as a scroll, the earth trembles before Him, and every mountain and island is moved out of its place. “Our God shall come, and shall not keep silence: a fire shall devour before Him, and it shall be very tempestuous round about Him. He shall call to the heavens from above, and to the earth, that He may judge His people.” Psalm 50:3, 4 . GC 641.2"
"Our God shall come, and shall not keep silence: a fire shall devour before him, and it shall be very tempestuous round about him."
EGW directly quotes Psalm 50:3.
"And the heaven departed as a scroll when it is rolled together; and every mountain and island were moved out of their places."
Both passages describe the heavens departing as a scroll and mountains/islands being moved, depicting a cataclysmic event. EGW uses the imagery from Revelation 6:14 to describe the Second Coming.