East gallery; Christ kneeling before a basin, preparing to wash the feet of the apostle, Peter; Andrew and Paul included on this face
Reference
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Washing of the feet is found in John, 8:1-7. Mandatum is the term for the liturgical ceremony on Holy Thursday. The antiphon for the ceremony is: Mandatum novum do vobis, ut diligatis invicem sicut dilexi vos (John 13-34).
Rupin noted that an article in the statues of Moissac (c. 1331, executed by Abbot Auger de Durfort) stipulated that on Holy Thursday, before the mandatum, 400 poor would be given bread, beans, deniers de Cahors, and sufficient wine.