NET
3 So I sent messengers to them saying, “I am engaged in an important work, and I am unable to come down. Why should the work come to a halt when I leave it to come down to you?”
Darby
3 And I sent messengers to them, saying, I am doing a great work, and I cannot come down. Why should the work cease, whilst I leave it and come down to you?
KJV
3 And I sent messengers unto them, saying, I [am] doing a great work, so that I cannot come down: why should the work cease, whilst I leave it, and come down to you?