The words are by Saint Thomas Aquinas. It has been set to many different musical compositions. Most popular seems to be Caesar Franck's version.

Panis angelicus 
Fit panis hominum:
Dat Panis coelicus 
Figuris terminum: 
O res mirabilis!
Manducat Dominum 
Pauper, servus et humilis.

Lo! the Angelic Bread 
Feedeth the sons of men:
Figures and types are fled 
Never to come again.
O what a wondrous thing! 
Lowly and poor are fed,
Banqueting on their Lord and King. 

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