Matthew 24:42

24:42 “Therefore stay alert, because you do not know on what day ¹  your Lord will come.

Matthew 24:44

24:44 Therefore you also must be ready, because the Son of Man will come at an hour when you do not expect him. ² 

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¹ tc Most later mss (L 0281 Ï lat) have here ὥρᾳ ({wra, “hour”) instead of ἡμέρα (Jemera, “day”). Although the merits of this reading could be argued either way, in light of the overwhelming and diverse early support for ἡμέρᾳ ({א B C D W Δ Θ Ë¹³ 33 892 1424, as well as several versions and fathers}), the more general term is surely correct.

² sn Jesus made clear that his coming could not be timed, and suggested it would take some time – so long, in fact, that some will not be looking for him any longer (at an hour when you do not expect him).