Cross reference
2 Peter 3:8
8 But, beloved, be not ignorant of this one thing, that one day is with the Lord as a thousand years, and a thousand years as one day.
Psalms 90:4
4 For a thousand years in thy sight are but as yesterday when it is past, and as a watch in the night.
Romans 11:25
25 For I would not, brethren, that ye should be ignorant of this mystery, lest ye should be wise in your own conceits; that blindness in part is happened to Israel, until the fulness of the Gentiles be come in.