Maleachi 3:17

Coming of the Lord to judgment. Mal 3:1. "Behold, I send my messenger, that he may prepare the way before me; and the Lord, whom ye seek, will suddenly come to His temple, and the angel of the covenant, whom ye desire; behold he comes, saith Jehovah of hosts." To the question, Where is or remains the God of judgment? the Lord Himself replies that He will suddenly come to His temple, but that before His coming He will send a messenger to prepare the way for Him. The announcement of this messenger rests upon the prophecy in Isa 40:3., as the expression וּפנּה דרך, which is borrowed from that passage, clearly shows. The person whose voice Isaiah heard calling to make the way of Jehovah in the desert, that the glory of the Lord might be revealed to all flesh, is here described as מלאך, whom Jehovah will send before Him, i.e., before His coming. This maleâkh is not a heavenly messenger, or spiritual being (Rashi, Kimchi), nor the angel of Jehovah κατ ̓ ἐξοχήν, who is mentioned afterwards and called maleakh habberı̄th, but an earthly messenger of the Lord, and indeed the same who is called the prophet Elijah in Mal 4:5, and therefore not "an ideal person, viz., the whole choir of divine messengers, who are to prepare the way for the coming of salvation, and open the door for the future grace" (Hengst.), but a concrete personality - a messenger who was really sent to the nation in John the Baptist immediately before the coming of the Lord. The idea view is precluded not only by the historical fact, that not a single prophet arose in Israel during the whole period between Malachi and John, but also by the context of the passage before us, according to which the sending of the messenger was to take place immediately before the coming of the Lord to His temple. It is true that…

In this chapter we have, I. A promise of the coming of the Messiah, and of his forerunner; and the errand he comes upon is here particularly described, both the comfort which his coming brings to his church and people and the terror which it will bring to the wicked (Mal 3:1-6). II. A reproof of the Jews for their corrupting God's ordinances and sacrilegiously robbing him of his dues, with a charge to them to amend this matter, and a promise that, if they did, God would return in mercy to them (Mal 3:7-12). III. A description of the wickedness of the wicked that speak against God (Mal 3:13-15), and of the righteousness of the righteous that speak for him, with the precious promises made to them (Mal 3:16-18).

3:17 special treasure: Israel had a privileged status as God’s people; they were his private property.