What does Malachi 2:8 mean?
God was very specific about the kinds of sacrifices which should have been offered (Leviticus 22:17–33). The Old Testament Law commanded the priests to honor God, on penalty of death (Numbers 18:32). And the priesthood of Israel was entrusted to a single tribe, allowing the knowledge to be passed directly through family lines (Numbers 18). Despite this, the current generation of priests are disobeying and dishonoring God (Malachi 2:2). Malachi's accusations against the priests are not coming out of the blue. These are principles which have been part of Israel's heritage for centuries. They are turning away from what they have been taught, and what they know is right.This is not merely a matter of sin between the priesthood and God. Israel's priests are supposed to be the messengers of God. The people look to them for instruction and spiritual guidance (Malachi 2:7). When these men are bitter, disobedient, and dishonest (Malachi 1:13), it leaves the people without proper leadership. This has caused them to sin against God as a nation.
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.
God will humiliate the priests who are insulting Him with improper sacrifices. While the priests are being unfaithful to God, the people of Israel are also being unfaithful to each other. In particular, they are marrying pagans, and committing divorce, which God absolutely despises. God's covenant with Israel included both blessings for obedience, and consequences for disobedience. And yet, as Israel disobeys, they blame God for their hardships. God's people are defying Him, then blaming Him for the end results!