"sent to turn the season of gladness into an occasion of grief and mourning? Feeling that it would be unsafe to have the ark near him, David determined to let it remain where it was. A place was found for it nearby, at the house of Obed-edom the Gittite. PP 705.1"
"And David was afraid of the Lord that day, and said, How shall the ark of the Lord come to me?"
EGW refers to David's fear and decision to leave the ark with Obed-edom, which is the core of 2 Samuel 6:9. It's not a direct quote, but a clear reference to the event and its underlying sentiment.
The fate of Uzzah was a divine judgment upon the violation of a most explicit command. Through Moses the Lord had given special instruction concerning the transportation of the ark. None but the priests, the descendants of Aaron, were to touch it, or even to look upon it uncovered. The divine direction was, “The sons of Kohath shall come to bear it: but they shall not touch any holy thing, lest they die.” Numbers 4:15 . The priests were to cover the ark, and then the Kohathites must lift it by the staves, which were placed in rings upon each side of the ark and were never removed. To the Gershonites and Merarites, who had in charge the curtains and boards and pillars of the tabernacle, Moses gave carts and oxen for the transportation of that which was committed to them. “But unto the sons of Kohath he gave none: because the service of the sanctuary belonging unto them was that they should bear upon their shoulders .” Numbers 7:9 . Thus in the bringing of the ark from Kirjath-jearim the…
"And when Aaron and his sons have made an end of covering the sanctuary, and all the vessels of the sanctuary, as the camp is to set forward; after that, the sons of Kohath shall come to bear it: but they shall not touch any holy thing, lest they die. These things are the burden of the sons of Kohath in the tabernacle of the congregation."
Ellen White directly references Numbers 4:15 in this passage.
"But unto the sons of Kohath he gave none: because the service of the sanctuary belonging unto them was that they should bear upon their shoulders."
Ellen White directly references Numbers 7:9 in this passage.
David and his people had assembled to perform a sacred work, and they had engaged in it with glad and willing hearts; but the Lord could not accept the service, because it was not performed in accordance with His directions. The Philistines, who had not a knowledge of God's law, had placed the ark upon a cart when they returned it to Israel, and the Lord accepted the effort which they made. But the Israelites had in their hands a plain statement of the will of God in all these matters, and their neglect of these instructions was dishonoring to God. Upon Uzzah rested the greater guilt of presumption. Transgression of God's law had lessened his sense of its sacredness, and with unconfessed sins upon him he had, in face of the divine prohibition, presumed to touch the symbol of God's presence. God can accept no partial obedience, no lax way of treating His commandments. By the judgment upon Uzzah He designed to impress upon all Israel the importance of giving strict heed to His requiremen…
"And when Aaron and his sons have made an end of covering the sanctuary, and all the vessels of the sanctuary, as the camp is to set forward; after that, the sons of Kohath shall come to bear it: but they shall not touch any holy thing, lest they die. These things are the burden of the sons of Kohath in the tabernacle of the congregation."
The EGW passage directly explains the principle behind the Uzzah incident, drawing heavily from the instructions in Numbers 4:15 regarding who could touch the ark and the consequences of disobedience. It amplifies the importance of following God's specific instructions.