The first of these verses exhibits the private life of the people as depraved by sin and folly; the second their public life as degraded by idolatry and lewdness; while the third points to the corresponding chastisement and its cause.
My people ask counsel at their stocks (literally, wood), and their staff declareth unto them. Rashi explains "stocks," or literally, "wood," to mean "a graven image made out of wood;" while Aben Ezra prefaces his exposition of this by an observation which serves well as a link of connection between the eleventh and twelfth verses.
It is as follows: "The sign that they are in reality without heart, is that my people turn to ask counsel of its stocks and wood." Kimchi not inaptly remarks, "They are like the blind man to whom his staff points out the way in which he should go."
The stupidity of idolatry and the sin of divination are hero combined. By the "wood" is meant an idol carved out of wood; while the staff may likewise have an image carved at the top for idolatrous purposes, or it may denote mode of divination by a staff which by the way it fell determined their course.
Theophylaet explains this method of divination as follows: "They set up two rods, and muttered some verses and enchantments; and then the rods falling through the influence of demons, they considered how they fell, whether forward or backward, to the right or the left, and so gave answers to the foolish people, using the fall of the rods for signs."
Cyril, who attributes the invention of rabdomancy to the Chaldeans, gives the same account of this method of divination. Herodotus mentions a mode of divination prevalent among the Scythians by means of willow rods; and Tacitus informs us that the Germans divined by a rod cut from a fruit-bearing tree.
"They (the Germans) cut a twig from a fruit tree, and divide it into small pieces, which, distinguished by certain marks, are thrown promiscuously on a white garment. Then the priest or 'the canton, it' the occasion be public—if private, the master of the family—after an invocation of the gods, with his eyes lifted up to heaven, thrice takes out each piece, and as they come up, interprets their signification according to the marks fixed upon them."
The sin and folly of any people consulting an idol of wood about the success or otherwise of an undertaking, or deciding whether by a species of teraphim or staff divination, is sufficiently obvious.
But the great aggravation of Israel's sin arose from the circumstance not obscurely hinted by the possessive "my" attached to "people." That a people like Israel, whom God had chosen from among the nations of the earth and distinguished by special tokens of Divine favor, and to whom he had given the ephod with the truly oracular Urim and Thummim, should forsake him and the means he had given them of knowing his will, and turn aside to gods of wood, evinced at once stupidity unaccountable and sin inexcusable.
"The prophet," says Calvin, "calls here the Israelites the people of God, not to honor them, but rather to increase their sin; for the more heinous was the perfidy of the people, that, having been chosen, they had afterwards forsaken their heavenly Father… Now this people, that ought to be mine, consult their own wood, and their staff answers them!"
For the spirit of whoredoms hath caused them to err, and they have gone a-whoring from under their God. In this part of the verse the prophet attempts to account for the extreme folly and heinous sin of Israel, as described in the first clause.
It was an evil spirit, some demoniac power, that had inspired them with an insuperable fondness for idolatry, which in prophetic language is spiritual adultery. The consequence was a sad departure from the true God and a sinful wandering away from his worship, notwithstanding his amazing condescension and love by which he placed himself in the relation of a husband towards them.