origin of the English word "mandate"), the first word of the phrase "Mandatum novum do vobis ut diligatis invicem sicut dilexi vos " ("A new commandment I give unto you: That you love one another, as I have loved you, that you also love one another.") This statement by Jesus in the Gospel of
John 13:34 by which Jesus explained to the Apostles the significance of his action of washing their feet. The phrase is used as the
antiphon sung in the Roman Rite during the "Mandatum"..."
https://en.m.wikipedia.org/wiki/Maundy_Thursday
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Also see
http://www.al.com/living/index.ssf/2017/04/what_is_maundy_thursday_1.html
Jesus Saves