2 Peter 3:5-8

For they willingly forget [the fact] that the heavens existed long ago by the word of God, and the earth was formed out of water and by water, through which the world at that time was destroyed by being flooded with water. [Gen 1:6-8; 7:11] But by His word the present heavens and earth are being reserved for fire, being kept for the day of judgment and destruction of the ungodly people. Nevertheless, do not let this one fact escape your notice, beloved, that with the Lord one day is like a thousand years, and a thousand years is like one day. [Ps 90:4]