"This knowledge of the conditions under which they would continue to enjoy the prospering hand of God, lent more than ordinary solemnity to the consecration service that was held by Ezra and his company of faithful souls just before their departure. “I proclaimed a fast there, at the river of Ahava,” Ezra has declared of this experience, “that we might afflict ourselves before our God, to seek of Him a right way for us, and for our little ones, and for all our substance.” “So we fasted and besought our God for this: and He was entreated of us.” Verses 21, 23 . PK 616.1"
"Then I proclaimed a fast there, at the river of Ahava, that we might afflict ourselves before our God, to seek of him a right way for us, and for our little ones, and for all our substance."
EGW directly quotes and references Ezra 8:21.