Matthew 12:36
"But I say unto you, That every idle word that men shall speak, they shall give account thereof in the day of judgment."
Cross References (ranked by relevance)
Ecclesiastes 12:14
58
For God shall bring every work into judgment, with every secret thing, whether it be good, or whether it be evil.
Romans 2:16
34
In the day when God shall judge the secrets of men by Jesus Christ according to my gospel.
Revelation 20:12
27
And I saw the dead, small and great, stand before God; and the books were opened: and another book was opened, which is the book of life: and the dead were judged out of those things which were written in the books, according to their works.