1. What the rule of the law was. The prophet is ordered to enquire of the priests concerning it (v. 11); for their lips should keep this knowledge, and the people should enquire the law at their mouth, Mal. ii. 7. Haggai himself, though a prophet, must ask the priests concerning the law. His business, as an extraordinary messenger, was to expound the providences of God, and to give directions concerning particular duties, as he had done, ch. i. 8, 9. But he would not take the priests' work out of the hands of those who were the ordinary ministers, and whose business it was to expound the ordinances of God, to teach the people the meaning of them, and to give the general rules for the observance of them. In a case of that nature, Haggai must himself consult them. Note, God has given to his ministers diversities of gifts, and calls them out to do diversities of services, so that they have need one of another, should make use one of another, and be helpful one to another. The prophet, though divinely inspired, cannot say to the priest, I have no need of thee, nor can the priest say so to the prophet. Perhaps Haggai was therefore ordered to consult the priests, that out of their own mouths he might judge both them and the people committed to their charge, and convict them of worse than ceremonial pollution. See Lev. x. 10, 11. Now the rules of the law, in the cases propounded, are, (1.) That he that has holy flesh in his clothes cannot by the touch of his clothes communicate holiness (v. 12): If one bear holy flesh in the skirt of his garment, though the garment is thereby so far made a devoted thing as that it is not to be put to common use till it has first been washed in the holy place (Lev. vi. 27), yet it shall by no means transmit a holiness to either meat or drink, so as to make it ever the better to those that use it. (2.) That he that is ceremonially unclean by the touch of a dead body does by his touch communicate that uncleanness. The law is express (Num. xix. 22), Whatsoever the unclean person touches shall be unclean; yet this Haggai will have from the priests' own mouth, for concerning those things that we find very plain in our Bibles yet it is good to have the advice of our ministers. The sum of these two rules is that pollution is more easily communicated than sanctification; that is (says Grotius), There are many ways of vice, but only one of virtue, and that a difficult one. Bonum oritur ex integris; malum ex quolibet defectu—Good implies perfection; evil commences with the slightest defect. Let not men think that living among good people will recommend them to God if they are not good themselves, but let them fear that touching the unclean thing will defile them, and therefore let them keep at a distance from it.