"Chapter 52—The Annual Feasts This chapter is based on Leviticus 23 . There were three annual assemblies of all Israel for worship at the sanctuary. Exodus 23:14-16 . Shiloh was for a time the place of these gatherings; but Jerusalem afterward became the center of the nation's worship, and here the tribes convened for the solemn feasts. PP 537"
"Three times thou shalt keep a feast unto me in the year. Thou shalt keep the feast of unleavened bread: (thou shalt eat unleavened bread seven days, as I commanded thee, in the time appointed of the month Abib; for in it thou camest out from Egypt: and none shall appear before me empty:) And the feast of harvest, the firstfruits of thy labours, which thou hast sown in the field: and the feast of ingathering, which is in the end of the year, when thou hast gathered in thy labours out of the field."
Ellen White directly references Exodus 23:14-16 in this passage.
"And the Lord spake unto Moses, saying,"
The EGW passage explicitly states that the chapter is based on Leviticus 23, making the connection direct and intentional.
"Three times thou shalt keep a feast unto me in the year."
The EGW passage explicitly mentions Exodus 23:14-16 as the basis for the discussion of annual feasts, making the connection direct and intentional.
The people were surrounded by fierce, warlike tribes, that were eager to seize upon their lands; yet three times every year all the able-bodied men and all the people who could make the journey were directed to leave their homes and repair to the place of assembly, near the center of the land. What was to hinder their enemies from sweeping down upon those unprotected households, to lay them waste with fire and sword? What was to prevent an invasion of the land, that would bring Israel into captivity to some foreign foe? God had promised to be the protector of His people. “The angel of Jehovah encampeth round about them that fear Him, and delivereth them.” Psalm 34:7 [A.R.V.]. While the Israelites went up to worship, divine power would place a restraint upon their enemies. God's promise was, “I will cast out the nations before thee, and enlarge thy borders: neither shall any man desire thy land, when thou shalt go up to appear before the Lord thy God thrice in the year.” Exodus 34:24 . …
"The angel of the Lord encampeth round about them that fear him, and delivereth them."
Ellen White directly references Psalms 34:7 in this passage.
"For I will cast out the nations before thee, and enlarge thy borders: neither shall any man desire thy land, when thou shalt go up to appear before the Lord thy God thrice in the year."
EGW directly quotes Exodus 34:24 to support her point about God's protection during the annual feasts. This is more than a thematic parallel; it's a direct reference.
"The first of these festivals, the Passover, the feast of unleavened bread, occurred in Abib, the first month of the Jewish year, corresponding to the last of March and the beginning of April. The cold of winter was past, the latter rain had ended, and all nature rejoiced in the freshness and beauty of the springtime. The grass was green on the hills and valleys, and wild flowers everywhere brightened the fields. The moon, now approaching the full, made the evenings delightful. It was the season so beautifully pictured by the sacred singer: PP 537.3"
"In the fourteenth day of the first month at even is the Lord’s passover."
While not a direct quote, the EGW passage is clearly setting the scene for the Passover, which Leviticus 23:5 explicitly defines. The connection is strong and intentional.