2 Peter 3:11-12; 1 Thessalonians 3:13

Since all these things are thus to be dissolved, what sort of people ought you to be in lives of holiness and godliness, waiting for and hastening the coming of the day of God, because of which the heavens will be set on fire and dissolved, and the heavenly bodies will melt as they burn!

so that he may establish your hearts blameless in holiness before our God and Father, at the coming of our Lord Jesus with all his saints. (ESV)