In three simple verses, Malachi rounds out his prophecy in simple summary. God’s word is clear!
God’s mob are to remember who they are: they are a covenantal people, with an identity found in the God who graciously loves them relentlessly.
God’s mob are to be reminded: a day is coming when the sin in, and of, God’s mob will be judged. God will prepare them for that day, sending a prophet to them, a prophet like Elijah.
As they listen to this word from God, God’s mob will be restored in repentance: they will be brought back to the covenant, or they will be completely devoted to destruction.
This really did take place – why else would Jesus be affirmed in His identity by the presence of Moses and Elijah? (Matt.17) Therefore, this really applies to us: as God’s mob, we must remember our identity, we must be reminded of the great day of sin judged (at Golgotha and in the future), and we must be a repentant restored people, obeying our God.