3:9 Cursed with a curse - Are greatly cursed.

Malachi 3:9 Parallel Commentaries

The Immutability of God
"Great God, how infinite art thou, What worthless worms are we!" But while the subject humbles the mind it also expands it. He who often thinks of God, will have a larger mind than the man who simply plods around this narrow globe. He may be a naturalist, boasting of his ability to dissect a beetle, anatomize a fly, or arrange insects and animals in classes with well nigh unutterable names; he may be a geologist, able to discourse of the megatherium and the plesiosaurus, and all kinds of extinct …
Charles Haddon Spurgeon—Spurgeon's Sermons Volume 1: 1855

God's Jewels.
(Schools.) MALACHI III. 17. "They shall be Mine, saith the Lord of Hosts, in that day when I make up My jewels." There is a legend of old time which tells us how a certain Jewish Rabbi returned to his home after a long absence. His first question was--"Where are my boys?" for his wife had greeted him alone. Then, instead of answering her husband's question, the wife asked his advice. She told him that some years before someone had lent her something very precious, and she would know whether after …
H. J. Wilmot-Buxton—The Life of Duty, a Year's Plain Sermons, v. 2

The Unchangeableness of God
The next attribute is God's unchangeableness. I am Jehovah, I change not.' Mal 3:3. I. God is unchangeable in his nature. II. In his decree. I. Unchangeable in his nature. 1. There is no eclipse of his brightness. 2. No period put to his being. [1] No eclipse of his brightness. His essence shines with a fixed lustre. With whom is no variableness, neither shadow of turning.' James 1:17. Thou art the same.' Psa 102:27. All created things are full of vicissitudes. Princes and emperors are subject to …
Thomas Watson—A Body of Divinity