Luke 17:6-10

But the Lord said, “If you had faith the size of a mustard seed, you could say to this mulberry tree, ‘Be uprooted and be planted in the sea’; and it would obey you.

“Now which of you, having a slave plowing or tending sheep, will say to him after he comes in from the field, ‘Come immediately and recline at the table to eat’?

On the contrary, will he not say to him, ‘Prepare something for me to eat, and properly clothe yourself and serve me while I eat and drink; and afterward you may eat and drink’?

He does not thank the slave because he did the things which were commanded, does he?

So you too, when you do all the things which were commanded you, say, ‘We are unworthy slaves; we have done only that which we ought to have done.’ ” Ten Men with Leprosy Healed