Here are 5 Bible verses about tribulation period from the Old and New Testaments of the Holy Bible (King James Version), sorted from most to least relevant.
Daniel 9:27 KJV
And he shall confirm the covenant with many for one week: and in the midst of the week he shall cause the sacrifice and the oblation to cease, and for the overspreading of abominations he shall make it desolate, even until the consummation, and that determined shall be poured upon the desolate.
Revelation 3:10 KJV
Because thou hast kept the word of my patience, I also will keep thee from the hour of temptation, which shall come upon all the world, to try them that dwell upon the earth.
2 Thessalonians 2:4 KJV
Who opposeth and exalteth himself above all that is called God, or that is worshipped; so that he as God sitteth in the temple of God, shewing himself that he is God.
Jeremiah 30:7 KJV
Alas! for that day is great, so that none is like it: it is even the time of Jacob’s trouble; but he shall be saved out of it.
Daniel 12:1 KJV
And at that time shall Michael stand up, the great prince which standeth for the children of thy people: and there shall be a time of trouble, such as never was since there was a nation even to that same time: and at that time thy people shall be delivered, every one that shall be found written in the book.