I must work (ἐμὲ δεῖ ἐÏγαÌζεσθαι)
The best texts read ἡμᾶς, us, instead of ἐμὲ, me. Literally, it is necessary for us to work. The disciples are thus associated by Jesus with Himself. Compare Joh 3:11.
Sent me, not us
The Son sends the disciples, as the Father sends the Son.