Matthew 25:13

25:13 Therefore stay alert, because you do not know the day or the hour. ¹ 

Mark 13:33

13:33 Watch out! Stay alert! ²  For you do not know when the time will come.

Mark 13:36

13:36 or else he might find you asleep when he returns suddenly.

¹ tc Most later mss (C³ ˹³ 1424^c Ï) also read here “in which the Son of Man is coming” (ἐν ᾗ ὁ υἱὸς τοῦ ἀνθρώπου ἔρχεται, en |h Jo Juio" tou anqrwpou ercetai), reproducing almost verbatim the last line of Matt 24:44. The longer reading thus appears to be an explanatory expansion and should not be considered authentic. The earlier and better witnesses ({̳⁵ א A B C* D L W Δ Θ Ë¹ 33 565 892 1424* lat co}) lack this phrase.

² tc The vast majority of witnesses (א A C L W Θ Ψ Ë^1,13 Ï lat sy co) have καὶ προσεύχεσθε after ἀγρυπνεῖτε (agrupneite kai proseucesqe, “stay alert and pray”). This may be a motivated reading, influenced by the similar command in Mark 14:38 where προσεύχεσθε is solidly attested, and more generally from the parallel in Luke 21:36 (though δέομαι [deomai, “ask”] is used there). As B. M. Metzger notes, it is a predictable variant that scribes would have been likely to produce independently of each other (TCGNT 95). The words are not found in B D 2427 a c {d} k. Although the external evidence for the shorter reading is slender, it probably better accounts for the longer reading than vice versa.