Gen, 4:4 (Abel brought of the first male offspring of his flock, offered it to the Lord).
Ex.34:19 (The first offspring among thy cattle, whether ox or sheep, a male, is mine).
Num. 18:17 (The first offspring of a cow, sheep, or the goat, are Holy unto the Lord).

Adam and Eve as the first sinners were first to have an Clean Animal slain for them by God and the first to offer Clean Animal sacrifices. Abel brought the first offspring of his flock. It was by this alone that he acknowledged himself a sinner, and professed faith in the promised Messiah. God testifying with his gifts, the thank offering and the sin offering, and by accepting them, that faith in the promised Seed was the only way in which he could accept the services and offering of mankind. God had made known that a sacrifice involving the shedding of blood would alone be acceptable to Him. Cain had definitely decided to disregard God’s will. We read that “Cain’s works were evil, and his brother’s was righteous” (1 John 3:12).

Gen.7:2-3 (Clean beast by seven pairs, male and female, unclean, by tow, male, female.)
Gen.8:20 (Noah builed an altar, sacrificed every clean beast and fowl on the alter).
Lev.11:3 (whatsoever parteth the hoof, and is clovenfooted, cheweth the cud, is clean).

God told Noah, “of every clean (pure) beast thou shall take to the by seven (pairs), the male and female; and of beasts that are not clean by two, the male and his female; of fowls also of the air by sevens, the male and female; to keep seed alive upon the face of the earth.” So we find the distinction between Clean and Unclean animals existed long before the Mosaic law. This distinction seem to have been originally designed to mark those animals which were proper for sacrifice and food, from those that were not. God speaks of unclean sacrifices, or such as should not be offered to the Lord. A new element is introduced into life--the flesh of the animals that may in the future be used as food. To this permission, however, a restriction is added. The sanctity of blood must be maintained, and in no circumstance whatever must be eaten, along with some animal, fowls, and fish of the sea.

Lev.11:1-47 (To make a difference between the unclean and the clean).
Deut. 14:3 (Thou shalt not eat any abominable thing).

Almighty God has given us examples of the four-footed animals that we may use for food. Also Goad has warned us specifically not to eat animals that would be harmful to us. Let us examine the marine and fresh water creatures that may be eaten. Our Heavenly Father has not specifically named any of the multitude of fish that can be eaten other than to say, “ Of creatures that live in water you may eat all those that have fins and scales, but you may not eat any that have neither fins nor scales, you shall regard them as unclean.”

Deut. 14:3-20 (But of all clean fowls ye may eat).
Lev.11:13 (These are abomination among the fowls; they shall not be eaten).

Concerning fowl that have the approval of God to be used as food, we find the following legislation in Deut., and Lev.11:13-19. It is obvious by scanning the list that once again a pattern emerges. The forbidden birds are those which are predators and flesh eaters. They have a very poor digestive system that is not suitable for refining the food they eat to the point where it will be thoroughly unclean for man’s use.

Isa.66:15-17 (Eating swine’s flesh, and the mouse (unclean thing), it is abomination).
Isa.65:3-4 (They did evil before mine eyes, and chose that in which I delighted not).

This end time prophecy is a proof that the unclean meat law is still binding! Do not mistake the fact that Almighty God has a day appointed when He will judge the world. People will be intertaining in the gardens by barbecuing Pork Steaks and other Abominable Things, and shall be consumed together, said Almighty God. “I have spread out My hands all the day unto a rebellious people, which walketh in a way that was not good, after their own thoughts; A people that provoketh Me to anger continually to My face.”

Acts 10:1-48 (I have never eaten anything that is common or unclean).
Lev.20:25 (Put difference between clean beast and unclean, between unclean fowls).

Acts 10 records Peter’s trance-vision in which a great sheet was let down from heaven bearing all manner of animal, birds and insect, both clean and unclean. A voice told Peter to “Kill and Eat.” Peter replied; “Not so Lord for I have never eaten anything that is Common or Unclean.”

No, it is not a lesson on Unclean Meats, yet it does use known laws, both Bible and Tradition, to teach anew; God is no respector of persons! We find Peter’s own statement in Acts 10:28 showing that the Apostle knew the message transmitted by the vision was not to kill Unclean Animals for food. “You know how that it is an unlawful thing for a man that is a Jew to keep company, or come unto one of another nation; but God hath shewed me that I should not call any man common or unclean.” Peter did not go and begin to kill hogs for food, but he did baptize Cornelius and his Family. Cornelius was a gentile.