"At the very foot of Sinai, Satan began to execute his plans for overthrowing the law of God, thus carrying forward the same work he had begun in heaven. During the forty days while Moses was in the mount with God, Satan was busy exciting doubt, apostasy, and rebellion. While God was writing down His law, to be committed to His covenant people, the Israelites, denying their loyalty to Jehovah, were demanding gods of gold! When Moses came from the awful presence of the divine glory, with the precepts of the law which they had pledged themselves to obey, he found them, in open defiance of its commands, bowing in adoration before a golden image. PP 335.1"
"And when the people saw that Moses delayed to come down out of the mount, the people gathered themselves together unto Aaron, and said unto him, Up, make us gods, which shall go before us; for as for this Moses, the man that brought us up out of the land of Egypt, we wot not what is become of him."
Both passages directly reference the golden calf incident during Moses' absence on Mount Sinai. EGW provides additional context and interpretation, emphasizing Satan's role in instigating the apostasy.
By leading Israel to this daring insult and blasphemy to Jehovah, Satan had planned to cause their ruin. Since they had proved themselves to be so utterly degraded, so lost to all sense of the privileges and blessings that God had offered them, and to their own solemn and repeated pledges of loyalty, the Lord would, he believed, divorce them from Himself and devote them to destruction. Thus would be secured the extinction of the seed of Abraham, that seed of promise that was to preserve the knowledge of the living God, and through whom He was to come—the true Seed, that was to conquer Satan. The great rebel had planned to destroy Israel, and thus thwart the purposes of God. But again he was defeated. Sinful as they were, the people of Israel were not destroyed. While those who stubbornly ranged themselves on the side of Satan were cut off, the people, humbled and repentant, were mercifully pardoned. The history of this sin was to stand as a perpetual testimony to the guilt and punishme…
"Now therefore let me alone, that my wrath may wax hot against them, and that I may consume them: and I will make of thee a great nation."
Both passages refer to God's potential destruction of Israel after the golden calf incident and the promise to make a great nation from Moses. EGW elaborates on Satan's plan to thwart God's purposes and the eventual pardon of the repentant Israelites.