English

Noun

thief in the night ‎(plural thieves in the night)

1. Something stealthy or that occurs without warning. (Usually used with like.)
   • 1611, Bible (KJV), Thessalonians-Chapter-5/#2 1 Thessalonians 5:2:

     For yourselves know perfectly that the day of the Lord so cometh as a thief in the night.