A Commentary, Critical, Practical, and Explanatory on the Old and New Testaments, by Robert Jamieson, A.R. Fausset and David Brown  at sacred-texts.com
lev 26:1OF IDOLATRY. (Lev 26:1-2)
Ye shall make you no idols--Idolatry had been previously forbidden (Exo 20:4-5), but the law was repeated here with reference to some particular forms of it that were very prevalent among the neighboring nations.
a standing image--that is, "upright pillar."
image of stone--that is, an obelisk, inscribed with hieroglyphical and superstitious characters; the former denoting the common and smaller pillars of the Syrians or Canaanites; the latter, pointing to the large and elaborate obelisks which the Egyptians worshipped as guardian divinities, or used as stones of adoration to stimulate religious worship. The Israelites were enjoined to beware of them.
lev 26:2Ye shall keep my sabbaths, and reverence my sanctuary--Very frequently, in this Book of the Law, the Sabbath and the sanctuary are mentioned as antidotes to idolatry.
lev 26:3A BLESSING TO THE OBEDIENT. (Lev 26:3-13)
If ye walk in my statutes--In that covenant into which God graciously entered with the people of Israel, He promised to bestow upon them a variety of blessings, so long as they continued obedient to Him as their Almighty Ruler; and in their subsequent history that people found every promise amply fulfilled, in the enjoyment of plenty, peace, a populous country, and victory over all enemies.
lev 26:4I will give you rain in due season, and the land shall yield her increase--Rain seldom fell in Judea except at two seasons--the former rain at the end of autumn, the seedtime; and the latter rain in spring, before the beginning of harvest (Jer 5:24).
lev 26:5your threshing shall reach unto the vintage, and the vintage shall reach unto the sowing time, &c.--The barley harvest in Judea was about the middle of April; the wheat harvest about six weeks after, or in the beginning of June. After the harvest came the vintage, and fruit gathering towards the latter end of July. Moses led the Hebrews to believe that, provided they were faithful to God, there would be no idle time between the harvest and vintage, so great would be the increase. (See Amo 9:13). This promise would be very animating to a people who had come from a country where, for three months, they were pent up without being able to walk abroad because the fields were under water.
lev 26:10ye shall eat old store--Their stock of old corn would be still unexhausted and large when the next harvest brought a new supply.
lev 26:13I have broken the bands of your yoke, and made you go upright--a metaphorical expression to denote their emancipation from Egyptian slavery.
lev 26:14A CURSE TO THE DISOBEDIENT. (Lev. 26:14-39)
But if ye will not hearken unto me, &c.--In proportion to the great and manifold privileges bestowed upon the Israelites would be the extent of their national criminality and the severity of their national punishments if they disobeyed.
lev 26:16I will even appoint over you terror--the falling sickness [PATRICK].
consumption, and the burning ague--Some consider these as symptoms of the same disease--consumption followed by the shivering, burning, and sweating fits that are the usual concomitants of that malady. According to the Septuagint, "ague" is "the jaundice," which disorders the eyes and produces great depression of spirits. Others, however, consider the word as referring to a scorching wind; no certain explanation can be given.
lev 26:18if ye will not yet for all this hearken unto me, then I will punish you seven times more--that is, with far more severe and protracted calamities.
lev 26:19I will make your heaven as iron, and your earth as brass--No figures could have been employed to convey a better idea of severe and long-continued famine.
lev 26:22I will also send wild beasts among you--This was one of the four judgments threatened (Eze 14:21; see also Kg2 2:4).
your highways shall be desolate--Trade and commerce will be destroyed--freedom and safety will be gone--neither stranger nor native will be found on the roads (Isa 33:8). This is an exact picture of the present state of the Holy Land, which has long lain in a state of desolation, brought on by the sins of the ancient Jews.
lev 26:26ten women shall bake your bread in one oven, &c.--The bread used in families is usually baked by women, and at home. But sometimes also, in times of scarcity, it is baked in public ovens for want of fuel; and the scarcity predicted here would be so great, that one oven would be sufficient to bake as much as ten women used in ordinary occasions to provide for family use; and even this scanty portion of bread would be distributed by weight (Eze 4:16).
lev 26:29ye shall eat the flesh of your sons--The revolting picture was actually exhibited at the siege of Samaria, at the siege of Jerusalem by Nebuchadnezzar (Lam 4:10), and at the destruction of that city by the Romans. (See on Deu 28:53).
lev 26:30I will destroy your high places--Consecrated enclosures on the tops of mountains, or on little hillocks, raised for practising the rites of idolatry.
cut down your images--According to some, those images were made in the form of chariots (Kg2 23:11); according to others, they were of a conical form, like small pyramids. Reared in honor of the sun, they were usually placed on a very high situation, to enable the worshippers to have a better view of the rising sun. They were forbidden to the Israelites, and when set up, ordered to be destroyed.
cast your carcases upon the carcases of your idols, &c.--Like the statues of idols, which, when broken, lie neglected and contemned, the Jews during the sieges and subsequent captivity often wanted the rites of sepulture.
lev 26:31I will make your cities waste--This destruction of its numerous and flourishing cities, which was brought upon Judea through the sins of Israel, took place by the forced removal of the people during, and long after, the captivity. But it is realized to a far greater extent now.
bring your sanctuaries unto desolation, and I will not smell the savour of your sweet odours--the tabernacle and temple, as is evident from the tenor of the subsequent clause, in which God announces that He will not accept or regard their sacrifices.
lev 26:33I will scatter you among the heathen, &c.--as was done when the elite of the nation were removed into Assyria and placed in various parts of the kingdom.
lev 26:34Then shall the land enjoy her sabbaths, as long as it lieth desolate, &c.--A long arrear of sabbatic years had accumulated through the avarice and apostasy of the Israelites, who had deprived their land of its appointed season of rest. The number of those sabbatic years seems to have been seventy, as determined by the duration of the captivity. This early prediction is very remarkable, considering that the usual policy of the Assyrian conquerors was to send colonies to cultivate and inhabit their newly acquired provinces.
lev 26:38the land of your enemies shall eat you up, &c.--On the removal of the ten tribes into captivity, they never returned, and all traces of them were lost.
lev 26:40If they shall confess their iniquity, &c.--This passage holds out the gracious promise of divine forgiveness and favor on their repentance, and their happy restoration to their land, in memory of the covenant made with their fathers (Rom. 2:1-29).
lev 26:46These are the statutes and judgments and laws--It has been thought by some that the last chapter was originally placed after the twenty-fifth [ADAM CLARKE], while others consider that the next chapter was added as an appendix, in consequence of many people being influenced by the promises and threats of the preceding one, to resolve that they would dedicate themselves and their possessions to the service of God [CALMET].