(18) Thou shalt not offer the blood of my sacrifice with leavened bread.--Some regard this prohibition as extending to all sacrifices; but the majority of commentators limit it to the sacrifice of the Paschal lamb, which was the only sacrifice as yet expressly instituted by Jehovah. According to modern Jewish notions, leavened bread is permissible at the other feasts; at Pentecost it was commanded (Leviticus 23:17).

The fat of my sacrifice.--Rather (as in the Margin), the fat of my feast. The fat of the Paschal lambs was burnt on the altar with incense the same evening. Thus the whole lamb was consumed before the morning. As the Paschal lamb is ??? ??????, "my sacrifice," so the Passover is "my feast."

Verse 18. - Law of the Paschal sacrifice. That the Paschal lamb is here intended by "my sacrifice," seems to be certain, since the two injunctions to put away leavened bread, and to allow none of the victim's flesh to remain till the morning (see Exodus 12:10), are combined in the Paschal sacrifice only. Of all the offerings commanded in the law the Paschal lamb was the most important, since it typified Christ. It may therefore well be termed, in an especial way, "God's sacrifice." By the fat of my feast some understand the fat of the lamb, others the best part of the feast (Keil) - i.e., the lamb itself. In Exodus 34:25, which is closely parallel to the present place, we read, for "the fat of my feast," "the sacrifice of the feast of the passover."

23:10-19 Every seventh year the land was to rest. They must not plough or sow it; what the earth produced of itself, should be eaten, and not laid up. This law seems to have been intended to teach dependence on Providence, and God's faithfulness in sending the larger increase while they kept his appointments. It was also typical of the heavenly rest, when all earthly labours, cares, and interests shall cease for ever. All respect to the gods of the heathen is strictly forbidden. Since idolatry was a sin to which the Israelites leaned, they must blot out the remembrance of the gods of the heathen. Solemn religious attendance on God, in the place which he should choose, is strictly required. They must come together before the Lord. What a good Master do we serve, who has made it our duty to rejoice before him! Let us devote with pleasure to the service of God that portion of our time which he requires, and count his sabbaths and ordinances to be a feast unto our souls. They were not to come empty-handed; so now, we must not come to worship God empty-hearted; our souls must be filled with holy desires toward him, and dedications of ourselves to him; for with such sacrifices God is well pleased.Thou shall not offer the blood of my sacrifice with leavened bread,.... This belongs to the feast of the passover; for, as all the Jewish writers agree, this sacrifice is the sacrifice of the passover, as it is sometimes called, see Exodus 12:27 now when the paschal lamb was killed, and its blood shed, and its flesh eaten, there was to be no leaven along with it; it was to be eaten with unleavened bread, and there was to be no leaven in their houses at this time; nay, it was not to be slain until all was removed: this was the first thing the Jews did, as soon as the fourteenth day was come, to search for leaven, remove and burn it; and this sense of the law is confirmed by the Targum of Jonathan, which is,"not a man shall slay, while there is leaven in your houses, the sacrifice of my passover;''and to the same purpose is the note of Jarchi:

neither shall the fat of my sacrifice remain until the morning; and indeed no part of the passover lamb was to remain until the morning, what did was to be burnt with fire, Exodus 12:10 the Targum of Jonathan is,"neither shall there remain without the altar the fat of the sacrifice of my passover until the morning, nor of the flesh which ye ate in the evening;''and so Jarchi interprets it of its not remaining without the altar.