John Wesley on Haggai 2:14

So - Polluted persons, touching what is clean, pollute it, so polluted Jews, polluted God's ordinances, while the outward performing of legal duties, left them as unholy in themselves, as they were before: somewhat more then is to be done. The soul is first to be purified, that they and we may offer up a pure offering. The people - The body of the Jews. Every work - Whatever they do, they pollute all by polluted hands. Offer - What they bring to the altar with impure hearts, is polluted by them.