Luke 12:3

“Wherefore whatever you have said in the darkness will be heard in the light, and what you have spoken in the ear in the inner chambers will be proclaimed on the housetops.”

The same is true of their words. Things spoken under cloak of the night will be brought into the light, things whispered in the ear in a private room will be shouted out from the housetops for all to hear. So they should take heed to what they say. Indeed for every idle word that a man shall speak he will give account of it on the Day of Judgment (Matthew 12:36). For that Day will be a day when all is brought into the light, and all men's secrets will be made known (Luke 8:17; Mark 4:22). All this will cause rejoicing for those who confess Christ, but for those who deny Christ, or blaspheme against the Holy Spirit it could be catastrophic (see Luke 12:8).