Charles H. Spurgeon on Psalms 106:33

He spake unadvisedly. A gracious person may be surprised and fall suddenly among thieves that lurk behind the bushes. Nay, very holy men, unless wonderful wary, may be quickly tripped up by sudden questions and unexpected emergencies. Who knows the subtilty of sin, and the deceitfulness of his own heart? Take heed of answering quickly, and send up sudden ejaculations to heaven before you reply to a weighty and doubtful motion. Samuel Lee.

Verse 34-38. The miracles and mercies which settled them in Canaan made no more deep and durable impressions upon them than those that fetched them out of Egypt; for by that time they were well warm in Canaan, they corrupted themselves, and forsook God. Observe the steps of their apostasy.

1. They spared the nations which God had doomed to destruction (Ps 106:34). When they had got the good land God had promised them, they had no zeal against the wicked inhabitants, whom the Lord commanded them to extirpate, pretending pity; but so merciful is God, that no man needs to be in any case more compassionate than he.

2. When they spared them, they promised themselves, that for all this, they would not join in any dangerous affinity with them; but the way of sin is down hill; omissions make way for commissions; when they neglect to destroy the heathen, the next news we hear is, they were mingled among the heathen, made leagues with them, and contracted an intimacy with them, so that they learned their works (Ps 106:35). That which is rotten will sooner corrupt that which is sound, than be cured or made sound by it.

3. When they mingled with them, and learned some of their works that seemed innocent diversions and entertainments, yet they thought they would never join with them in their worship; but by degrees they learned that too (Ps 106:36). They served their idols in the same manner, and with the same rites that they served them; and they became a snare unto them, that sin drew on many more, and brought the judgments of God upon them, which they themselves could not but be sensible of, and yet knew not how to recover themselves.

4. When they joined with them in some of their idolatrous services, which they thought had least harm in them, they little thought that ever they should be guilty of that barbarous and inhuman piece of idolatry, the sacrificing of their living children to their dead gods: but they came to that at last (Ps 106:37-38) in which Satan triumphed over his worshippers, and regaled himself in blood and slaughter. They sacrificed their sons and daughters, pieces of themselves to devils; and added murder, the most unnatural murder, to their idolatry; one cannot think of it without horror; they "shed innocent blood", the most innocent, for it was infant blood, nay, it was the "blood of their sons and their daughters." See the power of the spirit that works in the children of disobedience, and see his malice. The beginning of idolatry and superstition, like that of strife, is as the letting forth of water, and there is no villainy which they that venture upon it can be sure they shall stop short of, for God justly "gives them up to a reprobate mind" (Ro 1:28). Matthew Henry.