And the stork, the heron after her kind, and the lapwing, and the bat.

Jamieson-Fausset-Brown Bible Commentary

19. the stork-a bird of benevolent temper and held in the highest estimation in all Eastern countries; it was declared unclean, probably, from its feeding on serpents and other venomous reptiles, as well as rearing its young on the same food.

the heron-The word so translated only occurs in the prohibited list of food and has been variously rendered-the crane, the plover, the woodcock, the parrot. In this great diversity of opinion nothing certain can be affirmed regarding it. Judging from the group with which it is classified, it must be an aquatic bird that is meant. It may as well be the heron as any other bird, the more especially as herons abound in Egypt and in the Hauran of Palestine.

the lapwing-or hoopoe; found in warm regions, a very pretty but filthy species of bird. It was considered unclean, probably from its feeding on insects, worms, and snails.

the bat-the great or Ternat bat, known in the East, noted for its voracity and filthiness.

Matthew Henry's Concise Commentary

11:1-47 What animals were clean and unclean. - These laws seem to have been intended, 1. As a test of the people's obedience, as Adam was forbidden to eat of the tree of knowledge; and to teach them self-denial, and the government of their appetites. 2. To keep the Israelites distinct from other nations. Many also of these forbidden animals were objects of superstition and idolatry to the heathen. 3. The people were taught to make distinctions between the holy and unholy in their companions and intimate connexions. 4. The law forbad, not only the eating of the unclean beasts, but the touching of them. Those who would be kept from any sin, must be careful to avoid all temptations to it, or coming near it. The exceptions are very minute, and all were designed to call forth constant care and exactness in their obedience; and to teach us to obey. Whilst we enjoy our Christian liberty, and are free from such burdensome observances, we must be careful not to abuse our liberty. For the Lord hath redeemed and called his people, that they may be holy, even as he is holy. We must come out, and be separate from the world; we must leave the company of the ungodly, and all needless connexions with those who are dead in sin; we must be zealous of good works devoted followers of God, and companions of his people.
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Matthew Henry's Whole Bible Commentary

Verses 9-19

Here is, 1. A general rule concerning fishes, which were clean and which not. All that had fins and scales they might eat, and only those odd sorts of water-animals that have not were forbidden, v. 9, 10. The ancients accounted fish the most delicate food (so far were they from allowing it on fasting-days, or making it an instance of mortification to eat fish); therefore God did not lay much restraint upon his people in them; for he is a Master that allows his servants not only for necessity but for delight. Concerning the prohibited fish it is said, They shall be an abomination to you (v. 10-12), that is, "You shall count them unclean, and not only not eat of them, but keep at a distance from them." Note, Whatever is unclean should be to us an abomination; touch not the unclean thing. But observe, It was to be an abomination only to Jews; the neighbouring nations were under none of these obligations, nor are these things to be an abomination to us Christians. The Jews were honoured with peculiar privileges, and therefore, lest they should be proud of those, Transeunt cum onere-They were likewise laid under peculiar restraints. Thus God's spiritual Israel, as they are dignified above others by the gospel-covenant of adoption and friendship, so they must be mortified more than others by the gospel-commands of self-denial and bearing the cross. 2. Concerning fowls here is no general rule given, but a particular enumeration of those fowls that they must abstain from as unclean, which implies an allowance of all others. The critics here have their hands full to find out what is the true signification of the Hebrew words here used, some of which still remain uncertain, some sorts of fowls being peculiar to some countries. Were the law in force now, we should be concerned to know with certainty what are prohibited by it; and perhaps if we did, and were better acquainted with the nature of the fowls here mentioned, we should admire the knowledge of Adam, in giving them names expressive of their natures, Gen. 2:20. But the law being repealed, and the learning in a great measure lost, it is sufficient for us to observe that of the fowls here forbidden, (1.) Some are birds of prey, as the eagle, vulture, etc., and God would have his people to abhor every thing that is barbarous and cruel, and not to live by blood and rapine. Doves that are preyed upon were fit to be food for man and offerings to God; but kites and hawks that prey upon them must be looked upon as an abomination to God and man; for the condition of those that are persecuted for righteousness' sake appears to an eye of faith every way better than that of their persecutors. (2.) Others of them are solitary birds, that abide in dark and desolate places, as the owl and the pelican (Ps. 102:6), and the cormorant and raven (Isa. 34:11); for God's Israel should not be a melancholy people, nor affect sadness and constant solitude. (3.) Others of them feed upon that which is impure, as the stork on serpents, others of them on worms; and we must not only abstain from all impurity ourselves, but from communion with those that allow themselves in it. (4.) Others of them were used by the Egyptians and other Gentiles in their divinations. Some birds were reckoned fortunate, others ominous; and their soothsayers had great regard to the flights of these birds, all which therefore must be an abomination to God's people, who must not learn the way of the heathen.