"Satan urges before God his accusations against them, declaring that they have by their sins forfeited the divine protection, and claiming the right to destroy them as transgressors. He pronounces them just as deserving as himself of exclusion from the favor of God. “Are these,” he says, “the people who are to take my place in heaven and the place of the angels who united with me? While they profess to obey the law of God, have they kept its precepts? Have they not been lovers of self more than of God? Have they not placed their own interests above His service? Have they not loved the things of the world? Look at the sins which have marked their lives. Behold their selfishness, their malice, their hatred toward one another.” 5T 473.2"
"And I heard a loud voice saying in heaven, Now is come salvation, and strength, and the kingdom of our God, and the power of his Christ: for the accuser of our brethren is cast down, which accused them before our God day and night."
While not a direct quote, the EGW passage describes Satan's accusations against humanity before God, which aligns with the theme of Revelation 12:10 regarding Satan as the accuser.