The concept of the last days Tribulation period stems from a literal interpretation of certain Bible passages, particularly in the books of Daniel, Matthew, Revelation, and other prophetic passages. The first mention of the last days Tribulation is found in the following verse:

"When thou art in tribulation, and all these things are come upon thee, even in the latter days, if thou turn to the LORD thy God, and shalt be obedient unto his voice; (For the LORD thy God is a merciful God;) he will not forsake thee, neither destroy thee, nor forget the covenant of thy fathers which he sware unto them." - Deuteronomy 4:30–31 KJV. 

That is also the first occurrence of the word “tribulation” in scripture. Notice that it refers to a specific time of trouble for Israel in the “latter days.”

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