When the children of Israel were gathered out from among the Egyptians, the Lord said: “For I will pass through the land of Egypt this night, and will smite all the first-born in the land of Egypt, both man and beast; and against all the gods of Egypt I will execute judgment: I am the Lord.” And ye shall take a bunch of hyssop, and dip it in the blood that is in the basin, and strike the lintel and the two side posts with the blood that is in the basin; and none of you shall go out at the door of his house until the morning. For the Lord will pass through to smite the Egyptians; and when He seeth the blood upon the lintel, and on the two side posts, the Lord will pass over the door, and will not suffer the destroyer to come in unto your houses to smite you. And ye shall observe this thing for an ordinance to thee and to thy sons forever.” Exodus 12:12, 22-24 . The blood upon the lintel of the door symbolized the blood of Christ, who alone saved the first-born of the Hebrews from the cu…
"For the Lord will pass through to smite the Egyptians; and when he seeth the blood upon the lintel, and on the two side posts, the Lord will pass over the door, and will not suffer the destroyer to come in unto your houses to smite you."
EGW directly quotes Exodus 12:23.
"And the blood shall be to you for a token upon the houses where ye are: and when I see the blood, I will pass over you, and the plague shall not be upon you to destroy you, when I smite the land of Egypt."
Both passages discuss the significance of the blood on the doorposts as a sign of protection from God's judgment during the Passover. EGW explicitly connects this to the blood of Christ.