The Passover was instituted when the Israelites were in Egypt. Jehovah was about to cut off all the firstborn of Egypt, and the Israelites were ordered to sprinkle the blood of a lamb, taken for each house, on the lintel and two side posts of their houses. The promise was given, "The Lord will pass over the door, and will not suffer the destroyer to come in unto your houses to smite you." The Israelites obeyed, and, in perfect safety, fed upon the lamb under shelter of the blood. When they should come to the promised land, they were enjoined to keep the Passover as one of their yearly feasts (Ex. 12:3-28; Lev. 23:4-8).
The Passover sets forth typically the offering of Christ as that in which the righteousness of God in regard of sin has been declared. The blood was a witness of death, that is, of the removal from under the eye of God of the man, or order of man, that had sinned against God. This removal was brought to pass vicariously in the person of the righteous One who gave Himself a ransom for all. In the eating of the Iamb roast with fire, the people were to enter into the solemnity of what had been effected.
The Lord Jesus greatly desired to eat the last pass-over with His disciples, forming, as they did, a unique "family" circle. It was about to be fulfilled in the kingdom of God, and the Lord takes the place of separation from the earth until the kingdom of God should come (Luke 22:15-18).
Connected with the Passover is the feast of unleavened bread. This feast was kept for seven days, during which all leaven had to be put away. The first day and the seventh day were holy convocations, on which no servile work was to be done. This feast was intimately connected with the Passover: "Christ our Passover is sacrificed for us: therefore let us keep the feast, not with old leaven, neither with the leaven of malice and wickedness; but with the unleavened bread of sincerity and truth." The unleavened bread sets forth that sense of grace through faith, in the Christian, in which, apart from influences of the flesh and old associations, he can be habitually in the appreciation of and in communion with the sacrifice of Christ, so that his whole life is consistent therewith.
It appears evident that the term "Passover" was also applied to the feast of unleavened bread, as in Deut. 16:2. "Thou shalt therefore sacrifice the Passover unto the Lord thy God, of the flock and the herd." The "herd" here must refer to the seven days' feast, and this may account for the Jews' refusing to go into the judgment hall "lest they should be defiled; but that they might eat the Passover" (John 18:28), though they had eaten the paschal lamb the night before. Bible Dictionary
Joy in GOD is communion
presenting a wont to God is not communion.
“God talked with Abraham," "his friend"—
that is communion.