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).
Malachi 1:6—2:9 is directed specifically at the priests of Israel. Despite having knowledge of the Old Testament Law, they are offering improper sacrifices to God. Instead of following the requirements for pure offerings, they are sacrificing animals so defective that a mere politician would not accept them. This shows their apathy and disrespect towards God. In response, God warns that He will be praised properly, even if it's by the Gentiles, even if it's in spite of His own chosen people. This includes a threat to humiliate the priesthood, if they don't lead the people as they have been instructed.
Chapter 1 begins the first of three main messages in the book of Malachi. This is addressed to the priests, who have failed to do their duty. They are allowing improper sacrifices, they are not teaching the people, and they are acting in legalism and apathy. If the priests do not change, they will be under the curse of God. God's love for Israel is demonstrated by the counter-example of Edom. Edom's complete destruction was foretold in the book of Obadiah. This shows that God can punish disobedience with annihilation, but has not done so for Israel.