Matthew Poole and continuators on Exodus 12:27

27 That ye shall say, It is the sacrifice of the LORDS Passe-over , who passed over the houses of the children of Israel in Egypt, when he smote the Egyptians. And the people bowed the head , and worshipped.

The Passeover was both a Sacrifice, as it was offered to God, as it appears from Exod. 23. 18. and 34. 25. Numb. 9. 7, 13. Deut. 16. 2, 5. and because there was in it the shedding and sprinkling of blood, wherein the essence of a Sacrifice consists, 2 Chron. 30. 16. and 35. 11, 13. and also a Sacrament, as it was received and eaten by men.

In token of their thankful acknowledgement of Gods favours, and of their chearful submission to Gods command and ordinance. See 2 Chron. 29. 30.

Marginal references: chap. 4. 31.