"To what purpose is the multitude of your sacrifices unto me? saith the Lord: I am full of the burnt offerings of rams, and the fat of fed beasts; and I delight not in the blood of bullocks, or of lambs, or of he goats."
The EGW passage mentions "hypocrisy and mere formal worship." Isaiah 1:11 speaks against empty sacrifices without genuine repentance. While not a direct quote, the EGW passage aligns with the theme of Isaiah 1:11, which rejects superficial religious practices.
The aged leader urged the people to consider, in all its bearings, what he had set before them, and to decide if they really desired to live as did the degraded idolatrous nations around them. If it seemed evil to them to serve Jehovah, the source of power, the fountain of blessing, let them that day choose whom they would serve —“the gods which your fathers served,” from whom Abraham was called out, “or the gods of the Amorites, in whose land ye dwell.” These last words were a keen rebuke to Israel. The gods of the Amorites had not been able to protect their worshipers. Because of their abominable and debasing sins, that wicked nation had been destroyed, and the good land which they once possessed had been given to God's people. What folly for Israel to choose the deities for whose worship the Amorites had been destroyed! “As for me and my house,” said Joshua, “we will serve Jehovah.” The same holy zeal that inspired the leader's heart was communicated to the people. His appeals calle…
"And if it seem evil unto you to serve the Lord, choose you this day whom ye will serve; whether the gods which your fathers served that were on the other side of the flood, or the gods of the Amorites, in whose land ye dwell: but as for me and my house, we will serve the Lord."
The EGW passage directly quotes and paraphrases Joshua 24:15, including the key phrase "choose you this day whom ye will serve...but as for me and my house, we will serve the Lord." This is a clear and direct allusion.