Malachi closes the Old Testament history, but its history is not dead. The doctrine of Impartial Grace is defined in those sacred scriptures. The OT scriptures declare God is Sovereign over all that He creates. He is love and He is immutable. He is a disciplining Father. He has a plan, in fact, He is the plan of salvation. New Testament scriptures lean on what is old to usher in the new. The doctrine of Impartial Grace is affirmed in it.
The period of time from the closing of Malachi to the opening of the New Testament is called “The 400 Years of Silence.” The scholars at the “Got Questions” website provide a brief history of those 400 years. Israel may not have heard directly from God in those centuries, but there can be little doubt Israel was not ignored by Him. Israel was occupied by Greeks, Egyptians and lastly by the Roman Empire. Non-Jewish persons occupied the positions of authority and ruled as directed. The Jewish faith was watered down or abridged by authoritarians. Traditions took the place of sound instruction. “Got Questions” explains 1:
Between the time of Malachi and the coming of the Messiah, several prophecies were fulfilled, including the 2,300 days of desecration between 171 and 165 B.C. (Daniel 8:14). However, the people did not put to good use either the fulfilled prophecies nor the 400 years the nation was given to study Scripture, to seek God (Psalm 43-44), and to prepare for the coming Messiah. In fact, those years blinded and deafened the nation to the point where most of the Jews could not even consider the concept of a humble Messiah (Zechariah 9:9; Isaiah 6:10; John 12:40).
The Gospels give accounts of Christ Jesus unsettling the traditional authorities and expressing the Truth to the people. The Gospels give account of Divine love being explained, but rejected by the traditionalist authoritarians. Theirs are the doctrines established to elevate themselves over others and to establish personal kingdoms. Theirs are religious edicts passed with the blessing of sitting governments.
Christ Jesus sets the record straight.
1“What Were the 400 Years of Silence?” Got Questions website. https://www.gotquestions.org/400-years-of-silence.html. Date viewed: 4/10/2021.