"Five hundred years before, the Lord had declared by the prophet Zechariah: “Rejoice greatly, O daughter of Zion; shout, O daughter of Jerusalem: behold, thy King cometh unto thee: He is just, and having salvation; lowly, and riding upon an ass, and upon a colt the foal of an ass.” Zechariah 9:9 . Had the disciples realized that Christ was going to judgment and to death, they could not have fulfilled this prophecy. GC 405.1"
"Rejoice greatly, O daughter of Zion; shout, O daughter of Jerusalem: behold, thy King cometh unto thee: he is just, and having salvation; lowly, and riding upon an ass, and upon a colt the foal of an ass."
Ellen White directly references Zechariah 9:9 in this passage.