English translation:
In the name of Jesus may every knee of celestial, terrestrial and infernal creatures be bent, because the Lord was made obedient for us until death, until death on the cross.
Full text: MotettiB, No. 21, ff. 46v-47r
Translation: Eva Ferro
In nomine Iesu omne genu flectatur caelestium terrestrium et infernorum quia dominus factus est pro nobis obediens usque ad mortem, mortem autem crucis.
In the name of Jesus may every knee of celestial, terrestrial and infernal creatures be bent, because the Lord was made obedient for us until death, until death on the cross.
From Philippians 2:10.8.
No direct correspondence in a standard ref work could be found.
Ambrosian ingressa for Palm Sunday, see PM 6