Exodus 13:1 And the Lord spake unto Moses, saying, 2 Sanctify unto me all the firstborn, whatsoever openeth the womb among the children of Israel, both of man and of beast: it is mine.
[Patriarchs & Prophets pp 274>275] The first-born of both man and beast were to be the Lord's, to be bought back only by a ransom, in acknowledgment that when the first-born in Egypt perished, that of Israel, though graciously preserved, had been justly exposed to the same doom but for the atoning sacrifice. “All the first-born are Mine,” the Lord declared; “for on the day that I smote all the first-born in the land of Egypt, I hallowed unto Me all the first-born in Israel, both man and beast: Mine they shall be,” Numbers 3:13.
After the institution of the tabernacle service the Lord chose unto Himself the tribe of Levi for the work of the sanctuary, instead of the first-born of the people. “They are wholly given unto Me from among the children of Israel,” He said. “Instead of the first-born of all the children of Israel, have I taken them unto Me.” Numbers 8:16. All the people were, however, still required, in acknowledgment of God's mercy, to pay a redemption price for the first-born son. Numbers 18:15, 16.
The Passover was to be both commemorative and typical, not only pointing back to the deliverance from Egypt, but forward to the greater deliverance which Christ was to accomplish in freeing His people from the bondage of sin. The sacrificial lamb represents “the Lamb of God,” in whom is our only hope of salvation. Says the apostle, “Christ our Passover is sacrificed for us.” 1 Corinthians 5:7. It was not enough that the paschal lamb be slain; its blood must be sprinkled upon the doorposts; so the merits of Christ's blood must be applied to the soul.
Exodus 12:7 And they shall take of the blood, and strike it on the two side posts and on the upper door post of the houses, wherein they shall eat it. 8 And they shall eat the flesh in that night, roast with fire, and unleavened bread; and with bitter herbs they shall eat it.
May God add His blessing to the study of His word. “Good night” and God bless!