12 If one carries holy meat in the fold of his garment, and with the edge he touches bread or stew, wine or oil, or any food, will it become holy?" ' " Then the priests answered and said, "No." 13 And Haggai said, "If one who is unclean because of a dead body touches any of these, will it be unclean?" So the priests answered and said, "It shall be unclean." 14 Then Haggai answered and said, " 'So is this people, and so is this nation before Me,' says the Lord, 'and so is every work of their hands; and what they offer there is unclean.
Matthew Henry's Commentary on Haggai 2:12-14
Commentary on Haggai 2:10-19
(Read Haggai 2:10-19)
Many spoiled this good work, by going about it with unholy hearts and hands, and were likely to gain no advantage by it. The sum of these two rules of the law is, that sin is more easily learned from others than holiness. The impurity of their hearts and lives shall make the work of their hands, and all their offerings, unclean before God. The case is the same with us. When employed in any good work, we should watch over ourselves, lest we render it unclean by our corruptions. When we begin to make conscience of duty to God, we may expect his blessing; and whoso is wise will understand the loving-kindness of the Lord. God will curse the blessings of the wicked, and make bitter the prosperity of the careless; but he will sweeten the cup of affliction to those who diligently serve him.