One of the antiphons at the Washing of Feet in the Extraordinary Form of the Mass. It is the Offertory antiphon in the Ordinary Form. This exquisite setting is by Maurice Durufle wherein he incorporated the plainchant.
Ubi caritas et amor Deus ibi est. Congregavit nos in unum Christi amor. Exsultemus et in ipso jucundemur. Timeamus et amemus Deum vivum. Et ex corde diligamus nos sincero.
Where charity and love are, there is God. The love of Christ has gathered us together. Let us rejoice in Him and be glad. Let us fear and love the living God. And let us love one another with sincere hearts.