'Tribulation' in the Bible

I John, your brother and partaker with you in tribulation and kingdom and patience which are in Jesus, was in the isle that is called Patmos, for the word of God and the testimony of Jesus.

I know thy tribulation, and thy poverty (but thou art rich), and the blasphemy of them that say they are Jews, and they art not, but are a synagogue of Satan.

Fear not the things which thou art about to suffer: behold, the devil is about to cast some of you into prison, that ye may be tried; and ye shall have tribulation ten days. Be thou faithful unto death, and I will give thee the crown of life.

Behold, I cast her into a bed, and them that commit adultery with her into great tribulation, except they repent of her works.

And I say unto him, My lord, thou knowest. And he said to me, These are they that come of the great tribulation, and they washed their robes, and made them white in the blood of the Lamb.