I transposed this from F minor to E minor. The first phrase is identical to that in "Southwell." About halfway through the tune, there are two beats of rests that sound really odd to me, but I just followed the notation. The title of the tune (and the hymn text: "Behold the Lamb of God!") comes from John 1:29. "Ecce Agnus" is "Behold the Lamb" in Latin.