Malachi 3:6

“For I [am] the Lord, etc.] Or Jehovah; a name peculiar to the most High, and so a proof of the deity of Christ, who here speaks; and is expressive of his being; of his self-existence; of his purity and simplicity; of his immensity and infinity; and of his eternity and sovereignty: I change not; being the same today, yesterday, and forever; he changed not in his divine nature and personality by becoming man; he took that into union with him he had not before, but remained the same he ever was; nor did he change in his threatenings of destruction to the Jews, which came upon them according to his word; nor in his promises of his Spirit, and presence, and protection to his people; nor will he…”

“the Lord--Jehovah: a name implying His immutable faithfulness in fulfilling His promises: the covenant name of God to the Jews (Exo 6:3), called here "the sons of Jacob," in reference to God's covenant with that patriarch. I change not--Ye are mistaken in inferring that, because I have not yet executed judgment on the wicked, I am changed from what I once was, namely, a God of judgment. therefore ye . . . are not consumed--Ye yourselves being "not consumed," as ye have long ago deserved, are a signal proof of My unchangeableness. Rom 11:29 : compare the whole chapter, in which God's mercy in store for Israel is made wholly to flow from God's unchanging faithfulness to His own covenant of…”

“I am the Lord, I change not - , better, more concisely, “I, the Lord I change not - . The proper name of God, “He who Is,” involves His unchangeableness. For change implies imperfection; it changes to that which is either more perfect or less perfect: to somewhat which that being, who changes, is not or has not. But God has everything in Himself perfectly. “Thou Alone, O Lord, Art what Thou Art, and Thou Art Who Art. For what is one thing in the whole and another in parts, and wherein is anything subject to change, is not altogether what Is. And what beginneth from not being, and can be conceived, as not being, and only subsisteth through another thing, returns to not-being; and what hath a…”

“I change not - I have an unchangeable hatred to sin: and my long suffering also changeth not, therefore you are not consumed in your sins. Not consumed - God is the same in his wisdom to order the rewards of good and bad in the fittest season, therefore neither the one nor the other are consumed, but preserved to the season appointed of God. Malachi 3:7”

“3:6-12 Malachi’s fifth message echoes the first (1:2-5) by emphasizing God’s faithfulness to his promises. He calls Israel to a similar faithfulness in worship, especially in giving their tithes and offerings. If Malachi is a courtroom drama, the fifth message is the judge’s verdict. The real message is repentance—God wants honest and sincere worship from his people, of which tithing is a symbol.”

“I am: Gen 15:7, Gen 15:18, Gen 22:16; Exo 3:14, Exo 3:15; Neh 9:7, Neh 9:8; Isa 41:13, Isa 42:5-8, Isa 43:11, Isa 43:12; Isa 44:6, Isa 45:5-8; Jer 32:27; Hos 11:9 I change not: Num 23:19; Sa1 15:29; Psa 102:26; Heb 6:18, Heb 13:8; Jam 1:17; Rev 1:8; Rev 22:13 therefore: Psa 78:38, Psa 78:57, Psa 103:17, Psa 105:7-10; Isa 40:28-31; Lam 3:22, Lam 3:23; Rom 5:10; Rom 8:28-32, Rom 11:28, Rom 11:29; Phi 1:6; Th2 2:13, Th2 2:14 Malachi 3:7”