The painting is by Giovanni Batista. The lyrics and translation:
Ave verum corpus, natum de Maria Virgine,
vere passum, immolatum in cruce pro homine,
cuius latus perforatum fluxit aqua et sanguine:
esto nobis praegustatum in mortis examine.
O Iesu dulcis, O Iesu pie, O Iesu, fili Mariae.
Miserere mei. Amen.
Hail, true Body, born of the Virgin Mary,
who having truly suffered, was sacrificed
on the cross for mankind,
whose pierced side flowed with water and blood:
May it be for us a foretaste of the Heavenly banquet
in the trial of death.
Oh dear Jesus, Oh merciful Jesus, Oh Jesus, son of Mary,
have mercy on me. Amen.