Luke 12:3
"Therefore whatsoever ye have spoken in darkness shall be heard in the light; and that which ye have spoken in the ear in closets shall be proclaimed upon the housetops."
Cross References (ranked by relevance)
Matthew 10:27
12
What I tell you in darkness, that speak ye in light: and what ye hear in the ear, that preach ye upon the housetops.
Ecclesiastes 10:20
Curse not the king, no not in thy thought; and curse not the rich in thy bedchamber: for a bird of the air shall carry the voice, and that which hath wings shall tell the matter.
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.