"Chapter 49—The Last Words of Joshua This chapter is based on Joshua 23 and 24 . The wars and conquest ended, Joshua had withdrawn to the peaceful retirement of his home at Timnath- serah. “And it came to pass, a long time after that the Lord had given rest unto Israel from all their enemies round about, that Joshua ... called for all Israel, and for their elders, and for their heads, and for their judges, and for their officers.” PP 521"
"And Joshua called for all Israel, and for their elders, and for their heads, and for their judges, and for their officers, and said unto them, I am old and stricken in age:"
The EGW passage explicitly states that the chapter is based on Joshua 23 and 24 and directly quotes Joshua 23:2.
"aged chief. “Ye have seen,” he said, “all that the Lord your God hath done unto all these nations because of you; for the Lord your God is He that hath fought for you.” Although the Canaanites had been subdued, they still possessed a considerable portion of the land promised to Israel, and Joshua exhorted his people not to settle down at ease and forget the Lord's command to utterly dispossess these idolatrous nations. PP 521.2"
"And ye have seen all that the Lord your God hath done unto all these nations because of you; for the Lord your God is he that hath fought for you."
EGW directly quotes Joshua 23:3. The context is also the same.
"And when the Lord thy God shall deliver them before thee; thou shalt smite them, and utterly destroy them; thou shalt make no covenant with them, nor shew mercy unto them:"
Both passages discuss the command to utterly destroy the Canaanites. While EGW doesn't directly quote Deuteronomy 7:2, the theme of dispossessing the idolatrous nations is present in both.
"The people in general were slow to complete the work of driving out the heathen. The tribes had dispersed to their possessions, the army had disbanded, and it was looked upon as a difficult and doubtful undertaking to renew the war. But Joshua declared: “The Lord your God, He shall expel them from before you, and drive them from out of your sight; and ye shall possess their land, as the Lord your God hath promised unto you. Be ye therefore very courageous to keep and to do all that is written in the book of the law of Moses, that ye turn not aside therefrom to the right hand or to the left.” PP 521.3"
"And the Lord your God, he shall expel them from before you, and drive them from out of your sight; and ye shall possess their land, as the Lord your God hath promised unto you."
EGW directly quotes Joshua 23:5. The context is also the same.
"Ye shall observe to do therefore as the Lord your God hath commanded you: ye shall not turn aside to the right hand or to the left."
EGW directly quotes Deuteronomy 5:32. The context is similar, urging obedience to God's law.