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 a good animal for a bad one, people would substitute a bad animal for a good one, and say that it was better than the original; it was therefore the rule that, if any such change had taken place, both the "original sacrifice and the exchange thereof should be holy" (Lev. xxvii. 9). When a person redeems a thing devoted by him to the Sanctuary, he must likewise add one-fifth (Lev. xxvii. 13, 15); the reason for this is plain. Man is usually selfish, and is naturally inclined to keep and save his property. He would therefore not take the necessary trouble in the interest of the Sanctuary; he would not expose his property sufficiently to the sight of the valuer, and its true value would not be fixed. Therefore the owner had to add one-fifth, whilst a stranger paid only the exact value. These rules were laid down in order that people should not despise that with which the name of God is connected, and which serves as a means of approaching God. The oblation of the priest was entirely burnt (Lev. vi. 16), because the priest offered up his oblation by himself, and if he were to offer it, and at the same time to eat it, it would appear as if he had not performed any service. For nothing was offered upon the altar of the ordinary oblations of any person except the frankincense and a handful of the flour or cake; and if, in addition to the fact that the offering was small, he who offered it were himself to eat it, nothing of a sacrificial service would be noticed. It is therefore entirely burnt (Lev. vi. 16).

The reason of the particular laws concerning the Passover lamb is clear. It was eaten roasted by fire (Exod. xii. 8-9) in one house, and without breaking the bones thereof (ibid. ver. 46). In the same way as the Israelites were commanded to eat unleavened bread, because they could prepare it hastily, so they were commanded, for the sake of haste, to roast the lamb, because there was not sufficient time to boil it, or to prepare other food; even the delay caused by breaking the bones and to extract their marrow was prohibited the one principle is laid down for all these rules, "Ye shall eat it in haste" (Exod. xii. 11). But when haste is necessary the bones cannot be broken, nor parts of it sent from house to house; for the company could not wait with their meal till he returned. Such things would lead to laxity and delay, whilst the object of these rules was to make a show of the hurry and haste, in order that none should be too late to leave Egypt with the main body of the people, and be thus exposed to the attacks and the evil [designs of the enemy]. These temporary commandments were then made permanent, in order that we may remember what was done in those days. "And thou shalt keep this ordinance in his season from year to year" (Exod. xiii. 10). Each Passover lamb was only eaten by those who had previously agreed to consume it together, in order that people should be anxious to procure it, and should not rely on friends, relations, or on chance, without themselves taking any trouble about it before Passover. The reason of the prohibition that the uncircumcised should not eat of it (Exod. xii. 48) is explained by our Sages as follows: — The Israelites neglected circumcision during their long stay in Egypt, in order to make themselves appear like the Egyptians. When God gave them the commandment of the Passover, and ordered that no one should kill the Passover lamb unless he, his sons, and all the male persons in his household were circumcised, that only "then he could come near and keep it" (ibid. xii. 48), all performed this commandment, and the number of