Malachi
Malachi 3:14ESV·traditional attribution

You have said, ‘It is vain to serve God. What is the profit of our keeping his charge or of walking as in mourning before 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

Among the people of the Jews at this time, though they all enjoyed the same privileges and advantages, there were men of very different characters (as ever were, and ever will be, in the world and in the church), like Jeremiah's figs, some very good and others very bad, some that plainly appeared to be the children of God and others that as plainly discovered...

Commenting on Malachi 3:13-18

John Gill Reformed Baptist @doctorgill

Ye have said, it is vain to serve God,.... This they said in their hearts, if not with their lips, that it was a vain thing for a man to serve God; he got nothing by it; he had no reward for it; it fared no better with him than the wicked; nay, the wicked fared better than he; and therefore who would be a worshipper of God?