by night
Matthew 24:39
and they did not know till the flood came and took all away; so shall be also the presence of the Son of Man.
Matthew 24:50
the lord of that servant will arrive in a day when he doth not expect, and in an hour of which he doth not know,
Matthew 25:6
and in the middle of the night a cry was made, Lo, the bridegroom doth come; go ye forth to meet him.
1 Thessalonians 5:2
for yourselves have known thoroughly that the day of the Lord as a thief in the night doth so come,
2 Peter 3:10
and it will come -- the day of the Lord -- as a thief in the night, in which the heavens with a rushing noise will pass away, and the elements with burning heat be dissolved, and earth and the works in it shall be burnt up.