What does Malachi 1:6 mean?
Normal human experience tells us that fathers ought to be respected by their sons. The same is true of those who serve with respect to their superiors. Since that's obvious between different people, it ought to be all the more obvious between people and God. There is no possible excuse for disrespect when the guilty ones are priests—the very people given the most knowledge of God and His expectations. This is similar to the accusation Jesus will make of Israel's religious leaders in Matthew chapter 23.The allegation here is that these well-informed men are "despising" the name of God. As in verses 2 and 3, the extreme here is meant to show a contrast. The priests "despise" the name of God in the sense that they don't give Him the honor He is due. In addition, the response shows a lack of trust in God. The expression of doubt—"how?"—proves that Israel is not only far from God, they are indifferent to Him. They even doubt the truth of His words.
Verse 7 will explain the specific sin of the priesthood. The disrespect of the priests is summarized in their incorrect, apathetic sacrifices. Old Testament law was clear about the kind of offerings God expected (Leviticus 22:17–33). One modern application of this passage is to consider the obligations required of spiritual leaders (2 Peter 2:1). Church leaders are placed under higher scrutiny, since they have a great influence on the discipleship of others (James 3:1; Malachi 2:7).