The question presents itself, why keeping of the Passover should be necessary to covenant union with Jehovah. And the reply bears on Christian duty with regard to the analogous sacrament of the Lord's Supper, for it rests on the historical sanction and continuity of faith. If God was to be trusted as a Saviour by the Hebrew, certain facts in the nation's history had to be known, believed, and kept in clear remembrance; otherwise no reality could be found in the covenant. And under the new covenant the same holds good. The historical fact of Christ's crucifixion must be kept in view, and constantly revived by the Lord's Supper. In either case redemption is the main idea presented by the commemorative ordinance. The Hebrew festival is not to be held on the anniversary of the giving of the law; it recalls the great deliverance connected with the death of the first-born in Egypt. So the Christian festival points to the deliverance of humanity through the death of Christ. Remarkable is the congruity between the view of the law presented by Paul and the fact that the great commemorative feast of Hebraism is attached, not to the legislation of Sinai, but to the rescue from Egyptian bondage. The law kept the Hebrew nation in ward (Gal. iii. 23); "it was added because of transgressions, till the seed should come to whom the promise had been made" (Gal. iii. 19); it "came in beside, that the trespass might abound" (Rom. v. 20). The Hebrews were not required to commemorate that ordinance which laid on them a heavy burden and was found, as time went on, to be "unto death" (Rom. vii. 10). And, in like manner, the feast of Christianity does not recall the nativity of our Lord, nor that agony in the garden which showed Him in the depths of human sorrow, but that triumphant act of His soul which carried Him, and humanity with Him, through the shadow of death into the free life of spiritual energy and peace. The Sacrament of the Lord's Supper is the commemoration of a victory by which we are enfranchised. Partaking of it in faith, we realise our rescue from the Egypt of slavery and fear, our unity with Christ and with one another as "an elect race, a royal priesthood, a holy nation, a people for God's own possession." The wilderness journey lies before us still; but in liberty we press on as the ransomed of the Lord.