"***** Chapter 28—Moses and Aaron Upon Mount Hor Aaron died and was buried. Moses, Aaron's brother, and Eleazar, his son, accompanied him to the mount. The painful duty was laid upon Moses to remove from his brother Aaron the sacerdotal robes and place them upon Eleazar, for God had said that he should succeed Aaron in the priesthood. Moses and Eleazar witnessed the death of Aaron, and Moses buried him in the mount. This scene upon Mount Hor carries our minds back to some of the most striking events in the life of Aaron. 3T 293"
"And Moses stripped Aaron of his garments, and put them upon Eleazar his son; and Aaron died there in the top of the mount: and Moses and Eleazar came down from the mount."
The EGW passage directly recounts the events described in Numbers 20:28, including Aaron's death on Mount Hor and the transfer of his garments to Eleazar.
Aaron was a man of amiable disposition, whom God selected to stand with Moses and speak for him; in short, to be mouthpiece for Moses. God might have chosen Aaron as leader; but He who is acquainted with hearts, who understands character, knew that Aaron was yielding and lacked moral courage to stand in defense of the right under all circumstances, irrespective of consequences. Aaron's desire to have the good will of the people sometimes led him to commit great wrongs. He too frequently yielded to their entreaties, and in so doing dishonored God. The same lack of firmness for the right in his family resulted in the death of two of his sons. Aaron was eminent for piety and usefulness, but he neglected to discipline his family. Rather than perform the task of requiring respect and reverence of his sons, he allowed them to follow their inclinations. He did not discipline them in self-denial, but yielded to their wishes. They were not disciplined to respect and reverence parental authority…
"And he shall be thy spokesman unto the people: and he shall be, even he shall be to thee instead of a mouth, and thou shalt be to him instead of God."
The EGW passage directly alludes to Exodus 4:16, referencing Aaron's role as Moses' spokesman.