A.T. Robertson 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)

Sat down again (ανεπεσεν παλιν). Second aorist active indicative of αναπιπτω, old compound verb to fall back, to lie down, to recline. Παλιν (again) can be taken either with ανεπεσεν, as here, or with ειπεν (he said again).

Know ye what I have done to you? (γινωσκετε τ πεποιηκα υμιν; ). "Do ye understand the meaning of my act?" Perfect active indicative of ποιεω with dative case (υμιν). It was a searching question, particularly to Simon Peter and Judas.