Malachi
Malachi 3:1BSB·traditional attribution

“Behold, I will send My messenger, who will prepare the way before Me. Then the Lord whom you seek will suddenly come to His temple—the Messenger of the covenant, in whom you delight—see, He is coming,” says the LORD of Hosts.

John Calvin Reformed @genevareformer

CHAPTER 3 Malachi 3:1 1. Behold, I will send my messenger, and he shall prepare the way before me: and the Lord, whom ye seek, shall suddenly come to his temple, even the messenger of the covenant, who ye delight in: behold, he shall come, saith the LORD of hosts. 1.

Commenting on Malachi 3:1-18

Matthew Henry Presbyterian @wholebiblehenry

The first words of this chapter seem a direct answer to the profane atheistical demand of the scoffers of those days which closed the foregoing chapter: Where is the God of judgment? To which it is readily answered, "Here he is; he is just at the door; the long-expected Messiah is ready to appear; and he says, For judgment have I come into this world...

Commenting on Malachi 3:1-6

John Gill Reformed Baptist @doctorgill

Behold, I will send my messenger,.... These are the words of Christ, in answer to the question put in the last verse of the preceding chapter Mal 2:17, "Where is the God of judgment?" intimating that he would quickly appear, and previous to his coming send his messenger or angel; not the angel of death to destroy the wicked, as Jarchi thinks; nor an angel...