Jeremiah 4:2

“And thou shalt swear, the Lord liveth, etc.] Or by the living Lord, by him and him only; not by the creatures, but by the God of truth. This is sometimes put for the whole worship and service of God, (<050613>Deuteronomy 6:13) and for a confession of Christ, and profession of faith in him, (<234523>Isaiah 45:23), compared with (<451411>Romans 14:11) and which ought to be done, in truth, in righteousness, and in judgment; in sincerity, integrity, and uprightness of soul; in spirit and in, truth; in righteousness and true holiness: and the nations shall bless themselves in him, not in Israel, as the Targum, Jarchi, and Kimchi, interpret it; but in the Lord, even in the Messiah, the Lord Jesus…”

“And thou--rather, "And if (carried on from Jer 4:1) thou shalt swear, 'Jehovah liveth,' in truth, &c.", that is, if thou shalt worship Him (for we swear by the God whom we worship; compare Deu 6:13; Deu 10:20; Isa 19:18; Amo 8:14) in sincerity, &c. and the nations--Rather, this is apodosis to the "if"; then shall the nations bless themselves in (by) Him" (Isa 65:16). The conversion of the nations will be the consequence of Israel's conversion (Psa 102:13, Psa 102:15; Rom 11:12, Rom 11:15).”

“Swear - This is put here for the whole worship of God, acknowledging an& owning God as the only God; which is strongly exprest by this act. In truth - That the matter and substance of it be true. In judgment - Deliberately, advisedly, and reverently. In righteousness - That none be injured by it, that the things we engage be both lawful and possible, and that we look to the performance. The nations - This shall be a means to work upon the Heathen nations, to come into the same way of worship. They shall think themselves happy to be incorporated with thee, that it may be with them according to that promise, Gen 12:3. Glory - Whereas before they gloried in their idols, they shall glory in God…”

“4:2 As surely as the Lord lives: The correct attitude when offering a prayer of confession and making oaths reflects truth, justice, and righteousness. Truth means that the inner attitudes and thoughts of those praying match the words they utter. Justice means living by the laws of the Lord, who will judge the earth. Righteousness means that people relate to others in accordance with the Lord’s Spirit and the moral standards he has established. This kind of prayer requires a radical transformation of people’s inner lives and outer lifestyle (Gen 22:18; Deut 10:20; Ps 72:18; Isa 48:1; 1 Cor 1:31). If the Israelites returned to the Lord in this way, the people would be blessed, and their…”

“shalt swear: Jer 5:2; Deu 10:20; Isa 45:23, Isa 48:1, Isa 48:2, Isa 65:16 in truth: Jer 9:24; Kg1 3:6; Psa 99:4; Hos 2:19; Zac 8:8 and the nations: Gen 22:18; Psa 72:17; Isa 65:16; Gal 3:8 and in him: Jer 9:24; Isa 45:25; Co1 1:31; Co2 10:17; Phi 3:3 \*Gr. Jeremiah 4:3”