H a g g a i.(*): means festive, one of the twelve so called minor prophets. Written 520 B.C.E. He was the first of the three.(Zechariah, his contemporary and Malachi, who was about one hundred years later, being the other two).whose ministry belonged to the period of Jewish history which began after the return from captivity in Babylon. Scarcely anything is known of his personal history. He may have been one of the captives taken to Babylon by Nebuchadnezzar. He began his ministry about sixteen years after the Return. 

The object of the prophet was generally to urge the people to proceed with the rebuilding of the temple. The work of rebuilding the temple had been put a stop to through the intrigues of the Samaritans. After having been suspended for fifteen years, the work was resumed through the efforts of Haggai and Zechariah.(Ezra 6:14), who by their exhortations roused the people from their lethargy and induced them to take advantage of the favorable opportunity that had arisen in a change in the policy of the Persian government..(see an encyclopedia for Darius) 

Haggai's prophecies have thus been characterized: "There is a ponderous and simple dignity in the emphatic reiteration addressed alike to every class of the community, prince, priest and people 'Be strong, be strong, be strong':.Haggai 2:4. 'Cleave, stick fast, to the work you have to do;' or again, 'Consider your ways, consider, consider, consider':.Haggai 1:5,7; 2:15,18. It is the Hebrew phrase for the endeavor, characteristic of the gifted seers.(Isaiah 29:10).of all times, to compel their hearers to turn the inside of their hearts outwards to their own view, to take the mask from off their consciences, to 'see life steadily and to see it wholly.'"  ...Stanley's Jewish Church.

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Z e c h a r i a h.(*): means Jehovah is renowned or remembered. Written B.C.E. 520. A prophet of Judah, the eleventh of the twelve minor prophets. Like Ezekiel, he was of priestly extraction. His prophetical career began in the second year of Darius.(B.C.E. 520), about sixteen years after the return of the first company from exile. He was contemporary with Haggai:.Ezra 5:1. 

His book consists of two distinct parts, 1) chapters 1 to 8, inclusive and chapter 2:9 to the end. It begins with a preface chapter 1:1-6, which recalls the nation's past history, for the purpose of presenting a solemn warning to the present generation. Then follows a series of eight visions succeeding one another in one night, which may be regarded as a symbolical history of Israel, intended to furnish consolation to the returned exiles and stir up hope in their minds.

The symbolical action, the crowning of Joshua describes how the kingdoms of the world become the kingdom of the Creator's Christ. 

Chapters 7 and 8, delivered two years later, are an answer to the question whether the days of mourning for the destruction of the city should be any longer kept and an encouraging address to the people, assuring them of God's presence and blessing. 

The second part of the book, chapters 9-14, bears no date; consists of two burdens.

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M a l a c h i.(*): means messenger or angel, the last of the minor prophets and the writer of the last book of the Old Testament.canon:.Malachi 4:4-6. Written B.C.E. 397.

Nothing is known of him beyond what is contained in his book of prophecies. Some have supposed that the name is simply a title descriptive of his character as a messenger of Yah Vah.(the Creator, God).

He was contemporary with Nehemiah. 

The contents of the book are comprised in four chapters. In the Hebrew text the third and fourth chapters form but one. The whole consists of three sections, preceded by an introduction.(Malachi 1:1-5), in which the prophet reminds Israel of Creator's love to them.

The first section contains a stern rebuke addressed to the priests who had despised the name of their Creator and been leaders in a departure from his worship and from the covenant and for their partiality in administering the law.

Later the people are rebuked for their intermarriages with idolatrous heathen. And later yet Malachi addresses the people as a whole and warns them of the reaping of what they have sown, preceded by the advent.(means the coming or arrival).of the Messiah.