1:1 Malachi. Malachi, meaning “my messenger” or “my angel,” was the last of the Old Testament prophets, prophesying in about 430 B.C., although the precise date is very uncertain. This was at least several decades after the ministry of Haggai and Zechariah. The temple was completed and its worship restored, but it had already become corrupt. Malachi preached against the same sins that Nehemiah encountered when he came to Jerusalem.