Whoso wol preye, he moot faste and be clene,
And fatte his soule, and make his body lene.
Modern English:
Whoso will pray, he must fast and be clean,
And fat his soul, and make his body lean.

– Geoffrey Chaucer

The Canterbury Tales, The Summoner’s Tale. The Friar emphasizes the importance of fasting for those who pray. This rather hypocritically comes right after he orders a sizeable meal from the lady of the house.