en_tn/luk/12/40.md

because you do not know the hour when the Son of Man comes

The only similarity between a thief and the Son of Man is that people do not know when either one will come, so they need to be ready.

do not know the hour when

"do not know at what time"

when the Son of Man comes

Jesus is talking about himself. AT: "when I, the Son of Man, will come"