Sequence hymn (sung before the Gospel) for Pentecost Sunday; known as the Golden Sequence, it is one of the four sequence hymns (out of hundreds) that survived the liturgical cleanup at the Council of Trent.

Veni Sancte Spiritus
et emitte caelitus
lucis tuae radium.

Veni pater pauperum,
veni dator munerum,
veni lumen cordium.

Consolator optime,
dulcis hospes animae,
dulce refrigerium.

In labore requies,
in aestu temperies,
in fletu solacium.

O lux beatissima,
reple cordis intima
tuorum fidelium.

Sine tuo numine
nihil est in homine,
nihil est innoxium.

Lava quod est sordidum,
riga quod est aridum,
sana quod est saucium.

Flecte quod est rigidum,
fove quod est frigidum,
rege quod est devium.

Da tuis fidelibus
in te confidentibus
sacrum septenarium.

Da virtutis meritum,
da salutis exitum,
da perenne gaudium.

Come, Holy Spirit,
and send down from heaven
the ray of your light.

Come, father of the poor,
come, giver of gifts,
come, light of the hearts.

Best consoler,
sweet host of the soul,
sweet refresher.

Rest in work,
cooling in heat,
comfort in crying.

O most blessed light,
fill the innermost hearts
of your faithful.

Without your power
nothing is in man,
nothing innocent.

Clean what is dirty,
water what is dry,
heal what is wounded.

Bend what is rigid,
heat what is cold,
lead what has gone astray.

Grant to your faithful
who trust in you,
your sevenfold holy gift.

Grant us the reward of virtue,
grant us final salvation,
grant us eternal joy.

Text from ChoralWiki