"The king sought further to establish the faith of Judah in the God of their fathers by holding a great Passover feast, in harmony with the provisions made in the book of the law. Preparation was made by those having the sacred services in charge, and on the great day of the feast, offerings were freely made. “There was not holden such a Passover from the days of the judges that judged Israel, nor in all the days of the kings of Israel, nor of the kings of Judah.” 2 Kings 23:22 . But the zeal of Josiah, acceptable though it was to God, could not atone for the sins of past generations; nor could the piety displayed by the king's followers effect a change of heart in many who stubbornly refused to turn from idolatry to the worship of the true God. PK 405.1"
"Surely there was not holden such a passover from the days of the judges that judged Israel, nor in all the days of the kings of Israel, nor of the kings of Judah;"
Ellen White directly references 2 Kings 23:22 in this passage.
For more than a decade following the celebration of the Passover, Josiah continued to reign. At the age of thirty-nine he met death in battle with the forces of Egypt, “and was buried in one of the sepulchers of his fathers.” “All Judah and Jerusalem mourned for Josiah. And Jeremiah lamented for Josiah: and all the singing men and the singing women spake of Josiah in their lamentations to this day, and made them an ordinance in Israel: and, behold, they are written in the lamentations.” 2 Chronicles 35:24, 25 . Like unto Josiah “was there no king before him, that turned to the Lord with all his heart, and with all his soul, and with all his might, according to all the law of Moses; neither after him arose there any like him. Notwithstanding the Lord turned not from the fierceness of His great wrath, ... because of all the provocations that Manasseh had provoked Him withal.” 2 Kings 23:25, 26 . The time was rapidly approaching when Jerusalem was to be utterly destroyed and the inhabitan…
"His servants therefore took him out of that chariot, and put him in the second chariot that he had; and they brought him to Jerusalem, and he died, and was buried in one of the sepulchres of his fathers. And all Judah and Jerusalem mourned for Josiah."
EGW directly quotes 2 Chronicles 35:24 to describe Josiah's death and the mourning that followed. This is a clear and direct reference.