Charles Ellicott Commentary John 13:12

"So when he had washed their feet, and taken his garments, and sat down again, he said unto them, Know ye what I have done to you?" — John 13:12 (ASV)

And was set down again.—This means in the reclining position customary at meals. Compare to Luke 11:37; Luke 22:14; and in this Gospel John 6:10; John 21:20. Here it implies that the washing the feet preceded the supper (John 13:1).

Know ye what I have done to you?—This question is asked, not to be answered, but to direct their attention to what He had done, and to the interpretation which follows—“Do you perceive what I have done? This is the meaning of it.”