"The government of Israel was characterized by the most thorough organization, wonderful alike for its completeness and its simplicity. The order so strikingly displayed in the perfection and arrangement of all God's created works was manifest in the Hebrew economy. God was the center of authority and government, the sovereign of Israel. Moses stood as their visible leader, by God's appointment, to administer the laws in His name. From the elders of the tribes a council of seventy was afterward chosen to assist Moses in the general affairs of the nation. Next came the priests, who consulted the Lord in the sanctuary. Chiefs, or princes, ruled over the tribes. Under these were “captains over thousands, and captains over hundreds, and captains over fifties, and captains over tens,” and, lastly, officers who might be employed for special duties. Deuteronomy 1:15 . PP 374.2"
"So I took the chief of your tribes, wise men, and known, and made them heads over you, captains over thousands, and captains over hundreds, and captains over fifties, and captains over tens, and officers among your tribes."
Ellen White directly references Deuteronomy 1:15 in this passage.
"The Hebrew camp was arranged in exact order. It was separated into three great divisions, each having its appointed position in the encampment. In the center was the tabernacle, the abiding place of the invisible King. Around it were stationed the priests and Levites. Beyond these were encamped all the other tribes. PP 374.3"
"Every man of the children of Israel shall pitch by his own standard, with the ensign of their father’s house: far off about the tabernacle of the congregation shall they pitch."
The EGW passage elaborates on the arrangement of the Hebrew camp, which is mentioned in Numbers 2:2. The verse provides the basis for the description of the camp's organization around the tabernacle.