Luke 9:12; Luke 17:10

12 And when the day began to wear away, then came the twelve, and said unto him, Send the multitude away, that they may go into the towns and country round about, and lodge, and get victuals: for we are here in a desert place.

10 So likewise ye, when ye shall have done all those things which are commanded you, say, We are unprofitable servants: we have done that which was our duty to do.