John 9:4

4Usἡμᾶςit behoovesδεῖto workἐργάζεσθαιtheτὰworksἔργαof the [One]τοῦhaving sentπέμψαντόςMeμεwhileἕωςdayἡμέραit isἐστίν·is comingἔρχεταιnightνὺξwhenὅτεno oneοὐδεὶςis ableδύναταιto workἐργάζεσθαι.

It is necessary for us to work the works of the One having sent Me while it is day; night is coming, when no one is able to work.