Actually, there are several places that says the world will end...here is one example:
1.2 Peter 3:10
But the day of the Lord will come as a thief in the night; in the which the heavens shall pass away with a great noise, and the elements shall melt with fervent heat, the earth also and the works that are therein shall be burned up.
We tend to lose the distinction, between “world,” which is the nations, peoples and creatures of the planet, with the planet itself.
The planet doesn’t end. The created inhabitants and all their works, do.