1. He will be like a refiner's fire (2:17-3:5)

The Israelites complained that God cared nothing for justice and questioned his presence. Malachi responded by prophesying that God would send the messenger of the covenant. This messenger would refine and purify the Levites and once again the offerings of the people would be acceptable. He would also testify against injustice. This messenger, the Lord they were seeking, is Jesus. Jesus' death and resurrection cleanses us from our sin and we become acceptable to him.

2. Return to me, and I will return to you (3:6-12)

The LORD's mercy does not change. Despite the Israelites' regular disobedience, he did not destroy them but invited them to return to him in repentance. One way they could repent was to offer their tithes. If they did, God promised to pour out so much blessing that they wouldn't be able to store it. God also promised to protect them.