Capital Twenty-Five

Christ washed the feet of the apostles, then told them to do this to one another. Paul was included as an apostle, though he was not present in the biblical scene.
Biblical source: For the washing of feet episode:John 13:1-20.
Reference to the "mandate" or "commandment": John 13:34-35.

Inscribed: Jesus, Peter (reversed), Andrew, Paul, Bartholomew, Matthew, Jacob (James), John, Phillip, Thomas, Mandate (or Commandment).
The inscriptions are part of the compositions, and thus are scattered throughout the scenes, and are sometimes twisted around the figures.
Peter may be reversed on purpose, an inversion related to his inverted crucifixion (he was crucified upside-down according to common martyr legends, and as seen on capital 20.)

East View: The apostles hold the Old and New Testaments. Inscribed: BERTOLO[MEVS] MATHEVS	South View: Christ prepares to bathe the feet of the apostles. Inscribed: IESVS SVRTEP {PETRVS} ANDR[EAS] PAVLVS
West View: James the Lesser, Judas, and Simon, not identified by inscription. Inscribed: MANDATVM	North View: James, John, Phillip, and Thomas inscribed: IACOB[VS] IOAN[NES] FILIPI[S] TOMAS

DETAILS
Detail of North side: James, John, Phillip, and Thomas	Impost, west side: Flying figures with Hand of God.

John 13:1-20

¹ Now before the feast of the Passover, when Jesus knew that his hour had come to depart out of this world to the Father, having loved his own who were int he world, he loved them to the end.
² And during supper, when the devil had already put it into the heart of Judas Iscariot, Simon's son, to betray him,
³ Jesus, knowing that the Father had given all things into his hands, and that he had come from God and was going to God,
⁴ rose from supper, laid aside his garments, and girded himself with a towel.
⁵ Then he poured water into a basin, and began to wash the disciples' feet, and to wipe them with the towel with which he was girded.
⁶ He came to Simon Peter; and Peter said to him, "Lord, do you wash my feet?"
⁷ Jesus answered him, "What I am doing you do not know now, but afterward you will understand."
⁸ Peter said to him, "You shall never wash my feet." Jesus answered him, "If I do not wash you, you have no part in me."
⁹ Simon Peter said to him, "Lord, not my feet only but also my hands and my head!"
¹⁰ Jesus said to him, "He who has bathed does not need to wash, except for his feet, but he is clean all over; and you (plural) are clean, but not every one of you."
¹¹ For he knew who was to betray him; that is why he said, "You are not all clean."
¹² When he had washed their feet, and taken his garments, and resumed his place, he said to them, "Do you know what I have done to you?
¹³ You call me Teacher and Lord; and you are right, for so I am.
¹⁴ If I then, your Lord and Teacher, have washed your feet, you also ought to wash one another's feet.
¹⁵ For I have given you an example, that you also should do as I have done to you.
¹⁶ Truly, truly, I say to you, a servant is not greater than his master; nor is he who is sent greater than he who sent him.
¹⁷ If you know these things, blessed are you if you do them.
¹⁸ I am not speaking of you all; I know whom I have chosen; it is that the scripture may be fulfilled, 'He who ate my bread has lifted his heel against me.'
¹⁹ I tell you this now, before it takes place, that when it does take place you may believe that I am he.
²⁰ Truly, truly, I say to you, he who receives any one whom I send receives me; and he who receives me receives he who sent me."

John 13:34-35

³⁴ A new commandment I give to you, that you love one another; even as I have loved you, that you also love one another.
³⁵ By this all men will know that you are my disciples, if you have love for one another.

The New Oxford Annotated Bible with the Apocrypha, Revised Standard Version.
Inscriptions based on Robert Favereau, Jean Michaud, and Bernadette Leplant, Corpus des Inscriptions de la France Medievale. Vol. 8, Ariege, Haute-Garonne, Hautes-Pyrenees, Tarn-et-Garonne. Paris: Centre National de la Recherche Scientifique, 1982.