"...the trumpet shall sound, and the dead shall be raised incorruptible, and we shall be changed. For this corruptible must put on in-corruption, and this mortal must put on immortality. So when this corruptible shall have put on in-corruption, and this mortal shall have put on immortality, then shall be brought to pass the saying that is written, Death is swallowed up in victory. [1 Cor.15:52-54]

When our bodies are changed from mortality to immortality, Paul's quote: "Death is swallowed up in victory" from the book of Isaiah, will be fulfilled. 

"And in this mountain shall the Lord of hosts make unto all people a feast of fat things, a feast of wines on the lees, of fat things full of marrow, of wines on the lees well refined. And he will destroy in this mountain the face of the covering cast over all people, and the vail that is spread over all nations. He will swallow up death in victory..." [Isa.25:6-8]

It's quiet clear that the above passage will be fulfilled during the Passover Feast [5th-12th of May 2016], which becomes the Marriage Supper of the Lamb in Jerusalem, in heaven. This will be after we receive our immortal bodies on First-fruits, onSaturday the 7th of May 2016. http://thecreatorscalendar.com/2016-2/

"And he carried me away in the spirit to a great and high mountain, and shewed me that great city, the holy Jerusalem, descending out of heaven from God, Having the glory of God..." [Rev.21:10,11]

"Let us be glad and rejoice and give Him glory, for the marriage of the Lamb has come, and His wife has made herself ready...Then he said to me, “Write: ‘Blessed are those who are called to the marriage supper of the Lamb!’” [Rev.19:7,9]