This description of the Book of Haggai is from Easton's Bible Dictionary.
Haggai, Book of: consists of two brief, comprehensive chapters. The object of the prophet was generally to urge the people to proceed with the rebuilding of the temple.
Chapter one comprehends the first address (Haggai 1:2-11) and its effects (Haggai 1:2-15). Chapter two contains:
The second prophecy (Haggai 2:1-9), which was delivered a month after the first.
The third prophecy (Haggai 2:10-19), delivered two months and three days after the second; and
The fourth prophecy (Haggai 2:20-23), delivered on the same day as the third.
These discourses are referred to in Ezra 5:1; 6:14; Hebrews 12:26 (Comp. Haggai 2:7,8,22).