I assume he was referring to Matthew 24, where Jesus says, "So keep awake, because you don't know what day your master is coming.
20 Yesu a a swi tiva leswaku hi ta va ehansi ka ntshikilelo lowu hi susumetelaka ku panulula, kutani u tsundzuxile a ku: "Tshamani mi rindzile, hikuva a mi ri tivi siku leri Hosi ya n'wina yi nga ta ta ha rona."