Malachi prophesied in about 450BC, and had some harsh words about emplty rituals. He also spent a lot of time passing on GOD's promise of messiah. "But unto you that fear my name, a Sun of Righteousness shall rise, with healing in his wings."
After the prophecies here, GOD was silent until the arrival of John the Baptist.
A final promise of what is to come tomorrow....
You have lost your way.
Your faith you weaken in vain,
I will send my light.