Common Themes of the Old Testament Prophets.
Amongst the Holy Bible, themes constantly and consistently stream throughout. There are themes of love, hate, covenants, days that will come, justices that need to be brought about, and many more. This is apparent in the Old Testament when studying the prophets at a closer level. There are many prophets that God commissioned and many of were trying to spread similar themes of God.
The first theme to mention is one of the most common themes of all the prophets preaching in the Old Testament: the "Day of the Lord." Amos, Isaiah, and Zephaniah mention this theme multiple times throughout their reign as prophets. It is a day that will be the most terrifying and the most glorious day to date. It will be the horrid for those who have gone against the Lord and disobeyed. While at the same time it will be wonderful for those have lived a life of holiness. The "Day of the Lord" is a future day when the Lord will bring all of his enemies to their final defeat, but for those who have followed him then will be granted final prosperity. Ultimately this day is the final judgment day and ultimately only God's people will be saved.
Amos if the first prophet to speak of the "Day of the Lord." He warns his followers to apologize for their sins and urges them to believe in God; if they do not repent they will not survive the judgment day. Amos preaches to the people the horrors that the Lord has shared with him about the "Day of the Lord". Amos quotes, "I will make the sun go down at noon, and darken the earth in broad daylight. I will turn feast into mourning, and all your songs into lamentation" (Amos 8: 9-10). By passing down the Lord's word Amos is hoping to put fear in his people. He wants them all to repent to save themselves.
The next prophet's greatest message is to trust the Lord. Isaiah tells people if they put their faith in God, they will be saved from the "Day of the Lord".