Malachi 3:4

Then (And) shall the offering of Judah and Jerusalem - The "law," the new revelation of God, was to Isaiah 2:3. "go forth from Zion and the word of the Lord from Jerusalem." Judah and Jerusalem then are here the Christian Church. "They shall be, pleasant (literally sweet) unto the Lord." It is a reversal (using the self-same word) of what God had said of them in the time of their religious decay Hosea 9:4. "they shall not offer wine-offerings to the Lord, neither shall they be sweet unto Him; Jeremiah 6:20. your burnt-offerings are not acceptable, nor your sacrifices sweet unto Me."

As in the days of old - , before the days of degeneracy; as it stands in the ancient Liturgies "Vouchsafe to look upon them (the consecrated oblations) with a propitious and serene Countenance, and to accept them, as Thou vouchsafedst to accept the gifts of Thy righteous Abel and the sacrifice of our patriarch Abraham, and the holy sacrifice, the immaculate offering, which Thy high priest Melchizedec offered unto Thee." "The oblation of the sacrament of the eucharist, made by the Jews who should believe in Christ, which is known to have been first instituted by Christ in the city of Jerusalem, and afterward to have been continued by His disciples (Matthew 26 (29); Acts 2:42, Acts 2:46.) shall be pleasing unto the Lord, as the sacrifices of the patriarchs, Melchizedec, Abraham, and the holy priests in the law, as Aaron; yea, the truth takes precedence of the figure and shadow; the sacrifice of the new law is more excellent and acceptable to God, than all the sacrifice, of the law or before the law. With this agrees what the Lord saith to the synagogue Isaiah 1:25-26, Isaiah 1:28, "I will turn My hand upon thee, and purely purge away thy dross, and take away all thy tin; and I will restore thy judges as at the first, and thy counselors, as at the beginning: and the destruction of the transgressors, and of the sinners, shall be together, and they that forsake the Lord shall be consumed." So now it follows.

3:4 The offerings - The services and duties of the whole Christian church. Pleasant - Well pleasing to him.