2 Peter 3:8

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.

Psalm 90:4

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

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 hath happened to Israel, until the fullness of the Gentiles shall be come in.

1 Corinthians 10:1

Moreover, brethren, I would not that ye should be ignorant, that all our fathers were under the cloud, and all passed through the sea;

1 Corinthians 12:1

Now concerning spiritual gifts, brethren, I would not have you ignorant.

Treasury of Scripture Knowledge

Summary

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.

That one

General references

Bible References

Be not

Romans 11:25
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 hath happened to Israel, until the fullness of the Gentiles shall be come in.
1 Corinthians 10:1
Moreover, brethren, I would not that ye should be ignorant, that all our fathers were under the cloud, and all passed through the sea;
1 Corinthians 12:1
Now concerning spiritual gifts, brethren, I would not have you ignorant.

That one

Psalm 90:4
For a thousand years in thy sight are but as yesterday when it is past, and as a watch in the night.

General references

Job 10:5
Are thy days as the days of man? are thy years as man's days,
Psalm 114:4
The mountains skipped like rams, and the little hills like lambs.
Hebrews 10:37
For yet a little while, and he that is coming will come, and will not tarry.