Cross reference
2 Peter 3:8
8 And this one thing let not be unobserved by you, beloved, that one day with the Lord `is' as a thousand years, and a thousand years as one day;
Psalms 90:4
4 For a thousand years in Thine eyes `are' as yesterday, For it passeth on, yea, a watch by night.
Romans 11:25
25 For I do not wish you to be ignorant, brethren, of this secret -- that ye may not be wise in your own conceits -- that hardness in part to Israel hath happened till the fulness of the nations may come in;