1 Thessalonians 5:2

2Yourselvesαὐτοὶforγὰρfullyἀκριβῶςyou knowοἴδατεthatὅτι[the] dayἡμέραof [the] Lordκυρίουasὡςa thiefκλέπτηςbyἐνnightνυκτὶin this mannerοὕτωςcomesἔρχεται.

For you⁺ yourselves thoroughly know that the day of the Lord comes in this way, as a thief in the night.