John the Apostle
John 13:2ESV·traditional attribution

During supper, when the devil had already put it into the heart of Judas Iscariot, Simon’s son, to betray him,

John Calvin Reformed @genevareformer

2. After supper. “Et apres avoir souppe.” — “And after having supped.” We shall afterwards take into consideration, at the proper place, the whole of Christ’s design in washing the feet of his disciples, and the advantage to be derived from this narrative. Let us now attend to the connection of the words.

Matthew Henry Presbyterian @wholebiblehenry

It has generally been taken for granted by commentators that Christ's washing his disciples' feet, and the discourse that followed it, were the same night in which he was betrayed, and at the same sitting wherein he ate the passover and instituted the Lord's supper; but whether before the solemnity began, or after it was all over, or between the eating of the passover and...

Commenting on John 13:1-17

John Gill Reformed Baptist @doctorgill

And supper being ended,.... Or rather "supper being", or it "being supper time", for it was not ended; not the paschal supper, nor the Lord's supper, but the supper in Simon's house at Bethany, two days before the passover. There is no mention made in this whole chapter of the passover supper, or of any of its rites: the washing of the disciples' feet was...