"Thus the builders were not left to struggle alone; “with them were the prophets of God helping them;” and the Lord of hosts Himself had declared, “Be strong, ... and work: for I am with you.” Ezra 5:2 ; Haggai 2:4 . PK 577.2 With heartfelt repentance and a willingness to advance by faith, came the promise of temporal prosperity. “From this day,” the Lord declared, “will I bless you.” Verse 19 . PK 577.3"
"Then rose up Zerubbabel the son of Shealtiel, and Jeshua the son of Jozadak, and began to build the house of God which is at Jerusalem: and with them were the prophets of God helping them."
Ellen White directly references Ezra 5:2 in this passage.
"Yet now be strong, O Zerubbabel, saith the Lord; and be strong, O Joshua, son of Josedech, the high priest; and be strong, all ye people of the land, saith the Lord, and work: for I am with you, saith the Lord of hosts:"
Ellen White directly references Haggai 2:4 in this passage.
"To Zerubbabel their leader—he who, through all the years since their return from Babylon, had been so sorely tried—was given a most precious message. The day was coming, the Lord declared, when all the enemies of His chosen people would be cast down. “In that day, saith the Lord of hosts, will I take thee, O Zerubbabel, My servant, ... and will make thee as a signet: for I have chosen thee.” Verse 23 . Now the governor of Israel could see the meaning of the providence that had led him through discouragement and perplexity; he could discern God's purpose in it all. PK 577.4"
"In that day, saith the Lord of hosts, will I take thee, O Zerubbabel, my servant, the son of Shealtiel, saith the Lord, and will make thee as a signet: for I have chosen thee, saith the Lord of hosts."
The EGW passage directly quotes Haggai 2:23, making it a clear and explicit allusion.